Jason wakes up on a school bus holding some girls hand. Later it turns out that every bodies memories around him were altered and his memories got completely erased by Hera to include a son of Rome which Jason is since his father is the Roman form of Zeus that being Jupiter. The great issue of this series is the awakening of Gaia the ancient earth mother and her second children the giants. Hera has been captured so she can no longer hold together the Gods of Olympus which she usually does. So now after eventually arriving at Camp Half Blood and figuring out he is a Son of Jupiter and also speaks Latin much better than Ancient Greek. Chiron manages to figure out Heras Plan since he was also the Leader of CHB during the last war between the two Camps. So, Jason Piper, a daughter of Aphrodite, and Leo, a son of Hephaistos with the power to conjure flames, sets out on once again a great adventure to rescue Hera. During this Adventure they also not only meet and loose a bronze Dragon, but Jason also manages to capture a Venti a wind spirit which he uses as a horse to ride and fly around.
The second book has very little to do with the first as now we are once again following the adventures of Percy since he had just vanished before the first book happened. It is basically the same as Jason’s story just flipped around a Greek is now sent to the Roman Camp where he learns that Poseidon or Neptune as he is called by the romans is way less important during the rule of Rome seeing how their naval forces were far less important. So once again a prophecy is being read about a son of Neptune bringing either ruin or greatness to Rome once again. So of course Percy along with Frank who is a Son of Mars and can turn into basically any animal, as well as Hazel who is a daughter of Pluto and is cursed with precious but cursed gems popping up around her as a result of her returning from the underworld since she used to be dead. They travel to Alaska where they are not only trying to defeat one of the Titans but also recover the lost Standart of the twelfth legion. So after another adventure they end up on a Glacier in Alaska where they come across the old camp of the romans that got murdered by the Titan and he now rests there upon not only their old weapons but also their eagle which supposedly has the power to wield lightning. Now before going any deeper into the story there is this whole issue where titans can’t be killed either by demigods or gods on their own. They are forced to cooperate in order to send a titan back into the tartarus which is basically just killing them but less permanent. However with this titan it is a different story since he is completely unkillable and semi invulnerable in the land he was born in Alaska. However Frank being a Canadian remembers that the same Glacier they are on is also partly in Canada so he turns into an elephant and then drags him over the border and there with the help of Hazel he manages to kill the Titan. Meanwhile Percy has been fighting the undead legion on the Part of the Glacier they were originally on however after Hazel and Frank have left he doesn’t need to hold back and just obliterates the glacier After recovering all of the weapons as well as the eagle they get Orion who is a steed that has accepted Hazel as his new Master since he preferably eats Gold and also runs faster than the speed of sound and rush back to Camp Jupiter who are under siege by the Army of jet another giant the one that was designed to overthrow Poseidon as such he and Percy have an epic fight which Percy eventually wins using the lesser Greek Guard of Borders who protects new Rome which is the city part of the Camp.
So in the third book Annabeth, Leo, Piper and Jason are travelling to Camp Jupiter with the Airship that Leo has been building for the past months. Now while they are there and everything is actually going alright until Leo gets possessed by an evil spirit and opens fire on new Rome. So after fleeing the Romans obviously want to get some revenge for the greeks who burned down parts of their city so they begin moving out to rage war against CHB so in an effort to help out their friends in CHB they make an effort to get to the bottom of why romans and greeks hate one another which started thousands of years ago with the romans supposedly stealing and melting down a huge statue of Athena from the greeks. So in an effort to calm both camps they are now travelling to Rome since they are heading to Italy anyway to help close the gates of death so monsters and titans actually stay dead. Another reason why Annabeth is interested in finding this statue of her mother is another Prophecy that tells of a child of Athena alone and facing her greatest fear which are spiders since Athena created the mother of all spiders after she was beaten by her in a contest of skill. So now Annabeth has been tasked with finding the mark of Athena which will lead them to the Statue which they find underneath the city of Rome where Annabeth manages to trap Ariadne inside of a Chinese fingertrap that she made her spin herself. The rage of the goddess throwing her body around the cave trying to get free makes the earth split open as the other demigods come flying in through the now collapsing cave sealing and manage to rescue the statue Annabeth is caught in the web that held the place together in the first place however the spider which was also stuck in the web has fallen into the increasingly bigger cracks in the ground so now Annabeth and Percy who tried to safe his girlfriend are hanging over the edge to Tartarus and explain how they will find the doors of death on the other side so that they can finally close them once and for all.
So after the huge Cliffhanger in the last book, we start this one of with Annabeth and Percy falling down into Tartarus. Most of the book is focused on the two of them struggling with moving in the equivalents of the worst parts of hell. They also come across and manage to befriend bob who is a titan that Percy bathed in the River Lethe sometime after the final book from the Percy Jackson Saga. With this newfound friend they do eventually manage to make it to doors of death from the bottom side and remove the chains which bound it in place and kept it open. However, they find out that one person has to keep holding down a button until the others have returned to the surface, knowing that he is immortal and will be reborn Bob sacrifices himself and so we loose the only friendly titan ever introduced to us as Annabeth and Percy are struggling to keep the doors closed while ascending to the top. In the meantime, the rest of the seven are struggling seeing how they have lost not only the brains of their operation Annabeth, but also the glue that holds them together, Percy. Eventually they make it to Greece to the Cave of the Oracle which is the location of the doors in the mortal realm. It is important to mention that during this time Reina the leader of the romans has been travelling to their location to return the now found statue of Athena to bring piece and unite the two camps. So, after arriving in the cave, they have to of course once again fight their way through during which Hazel learns to do wizardry and Frank becomes a Legionary to command an army of fallen romans which Jason can’t anymore since he is struggling with whether he is roman or Greek. So, after finally being reunited once again and the doors of death finally closed once and for all Nico along with Reina begin shadow travelling back to Europe. This is basically moving through the shadows with himself and others. And the seven demigods set out as a full crew once more to make their last bit of travel.
Once again, we arrive at a grand showdown. Reina and Nico manage to put up the statue on top of the hill next to CHB and thus stop another Civil war from happening and managing to reunite the Camps before the Army of Gaia shows up. At the same time the Demigods make their way to the original Olymp Mount Olympus. Now once again I have to introduce another Prophecy which states that the blood of Olympus will awaken Gaia fully. Now over the course of the last books it has been revealed that the blood of a male and female Demigod is needed to awaken the Earthmother. Now to continue the story the seven arrive at Mount Olympus where the Titans are already assembled and ready to defend it. However, a bit of fighting the gods also decide to finally join in and help their children allowing each of the seven to fight alongside their parent and just wipe the floor with the Titans who now that the doors are closed can’t get back out of Tartarus. However, since we can’t seem to catch a breath both Percy and Annabeth get injured during the fight and after a single drop of Percy’s blood makes contact with the ground Gaia starts to wake. However, Leo has been expecting things to go wrong and being the engineer that he is has been reconstructing Festus the bronze Dragon from book one. Once Gaia appears for the first time Leo, Jason and Piper together pick her up and carry her high into the sky where they get blown up by Octavian who is a fucking delusional idiot to say the least. After the explosion Jason and Piper are recovered however Leo and Festus are gone. In the final chapter however, we realise that Leo has lived and is now saving Calypso who he fell in love with during their travels.