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The Big Three (A Percy Jackson and 39 Clues Crossover)

Reads 6,166
Votes 256
Parts 10
Time 1h 2m

Reads 6,166
Votes 256
Parts 10
Time 1h 2m

amycahill cahill dancahill percyjackson the39clues

Percy Jackson has been assigned a task to get two people who were handpicked by the three major gods, Zeus, Poseidon and Hades, to hold the key to their powers. 
Unfortunately, those two people have turned out to be Dan and Amy Cahill. Percy is meant to bring these two to Camp Half Blood so they can be safe. But will they be safe?
Read on to find out!All Rights Reserved

amycahill cahill dancahill percyjackson the39clues

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Percy Jackson's Quest at Hogwarts by lillianreads21

Percy gets taken from Camp Half-Blood to Hogwarts with one order from Zeus: find an ancient magical object that was taken from the gods. Harry, Ron, and Hermione help him as much as they can, but clearly there is something more going on.

To Save Olympus by Lilmia13

Three demigods just want to have a normal life in Camp Half Blood, but Olympus is falling again, and our great heroes, the seven, have been dead for years.(naturally, not by killing) It looks like someone else is going to have to save Olympus. Meet Mira, daughter of Poseidon, Jospeh, son of Hephaestus, and Clara, daughter of Athena, my three new demigods added into Rick Riordan's world. [written by a thirteen year old me]

"Let Poseidon Drown Me." A PJO Oc Fanfic. by F1nneysfr33d0m

"The Oracle said that two siblings were to join Camp Half-Blood and either destroy Half-Blood Hill or rebuild it." Two halfbloods are faced with new challenges unknown to the dullness of mortals. However, despite the terrible torturers that they must face, they'll always have each other to count on. How will August Cullen and Marceline Edwards counter the struggles that demigods face through? This is my AU where the Gods create the other cabins and The Bronze Trio (Jason, Piper, and Leo) arrive early. Most (almost none) of this will happen in canon, so I decided to do it myself. Enjoy! All characters of Percy Jackson and The Olympians belong to Rick Riordan!

Poseidon's Daughter; A Percy Jackson Fanfiction by Writer_Reader05

Book One Y/n L/n isn't like most demigods. Being a daughter of Poseidon makes her an outcast, especially since the Big Three swore to never have children again. Plus, she doesn't conform to the normal stereotypes that one would expect from a child of the sea god. But Y/n was used to that, until her life turns upside down when she meets her half-brother, Percy Jackson. Together, along with their friends, they must survive quests that put them in harms way and face Kronos, the greatest threat Camp Half Blood has faced in quite some time. And it all starts with Zeus' stolen lightning bolt. Book Two: A Quest of Eight; A Heroes of Olympus Fanfiction Book Three: The Exiled God; A Trials of Apollo Fanfiction All rights go to Rick Riordan. I only own Y/n and her contributions to this book.

'•' The Sea of Monsters '•' by Vi_The_Fangirl

The Neridia Jackson Series - 2 '•' Now that Neridia is gone, things are stirring up at Camp Half-Blood. Not that the Daughter of Poseidon knows, she's risking her life on the monster filled cruise ship, The Andromeda. Each day she preforms gruesome tasks in the name of the gods' worst enemy, relaying information back to Camp Half-Blood. But when her closest friends show up on the ship one day, Neridia is whisked away on another quest, journeying through The Sea of Monsters. '•' !! Percy Jackson and The Olympians and all related figures belong to Rick Riordan, not me !! '•' Status: Complete Editing: Complete

Percy Jackson The Dark Angel by OBookWormO

Percy felt useless at Camp Half Blood. After David Roberts son of Zeus arrived at Camp Half Blood everyone started to ignore Percy. Even the Gods did. Poseidon himself was ignoring Percy. His own son! He didn't know why at first but then he figured it out. David had told everyone at Camp Half Blood that Percy left him fighting monsters on his own while Percy just stood there watching. He was lying! But everyone believed him even Annabeth Chase the love of his life. One day he saw Annabeth and David kissing. That was the last string. At midnight he decided to pack his bags and run away. But while running away he fell into Tartarus again because a monster somehow kidnapped him in his sleep! But when he's in Tartarus, Chaos the creator of the universe saved him! Then what happened? He became the 2nd in command of Chaos' angel army and the 2nd most powerful person alive. He even brought back a few dead friends. Warning: I wrote this when I was 12.

Children of chaos by SaphiravonStar

All characters and rights belong to Rick Riordan. Chaos and his wife have to hide their two kids on earth with the Olympians. They think they are save but when the whole thing with the prophecies is going to happen even they have to help. Thalia and Percy are brother and sister children of Chaos and raised on Olympus until they are sent to Camp Half Blood. They don't even realize that they are two of the most powerful people in the universe and it had to be kept that way. They think that they are the children of Zeus and Poseidon but have the same mom. What will happen when someone finds out the truth. How will there participation in the great prophecies happen and what will change.

UnKnown [Book 1] by Wisegirl502

Luke and Silena Jackson, the two children of the famous demigods Percy and Annabeth Jackson, have lived the lives ignorant of their divine heritage. When their parents are kidnapped, their world turns upside down when their grandparents from the divine side pops up out of nowhere... literally... When the two siblings reach camp, they're greeted by an amiable son of Apollo and a very temperamental daughter of Zeus who becomes a surprising ally. The four of them along with another demigod, go in pursuit of the missing Jackson parents, having deceit, lies, and disappointment greeting them the whole way there. A simple rescue mission turns into something much bigger than anyone could have imagined.

Thank Goddess For My Twin (Book one of The Prophecy(Completed)) by aesthetically0urs

Hunter and Dean Storm. A pair of twins. Semi average, except that they are always on the run from cops and orphanages. One day, they soon go to an unusual high school, where they meet three very different people. Join Hunter and Dean on their adventure that contains heartbreak, love, humor, and all that great stuff. Percy jackson belongs to our dearest Uncle Rick who might kill them off... If it was up to me I wouldn't hurt a hair ion their precious heads... (especially Nico... Bless that beautiful boy!! <3) I only own the people who Rick obviously doesn't...

The Life of Angel || Luke Castellan by angelicarodz

The daughter of Poseidon and Athena wants to go to Camp Half-Blood. (Warning: I was like 12 when I wrote this so it's VERY all over the place and there's really no fixing it so....🤷‍♀️🤷‍♀️ Enjoy!)

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Slide 1 of 10

Percy Jackson's Quest at Hogwarts cover

To Save Olympus cover

"Let Poseidon Drown Me." A PJO Oc Fanfic. cover

Poseidon's Daughter; A Percy Jackson Fanfiction cover

'•' The Sea of Monsters '•' cover

Percy Jackson The Dark Angel cover

Children of chaos cover

UnKnown [Book 1] cover

Thank Goddess For My Twin (Book one of The Prophecy(Completed)) cover

The Life of Angel || Luke Castellan cover

Percy Jackson's Quest at Hogwarts

Percy gets taken from Camp Half-Blood to Hogwarts with one order from Zeus: find an ancient magical object that was taken from the gods. Harry, Ron, and Hermione help him as much as they can, but clearly there is something more going on.