Percy Jackson woke up aged 7 with no memory. All he has from his past is a necklace with some beads on it and a vague recollection of a girl with princess hair smiling at him and holding his hand. This girl holds the answers to who he is, he knows it - but when he goes looking for her, he ends up getting tangled up with con-artists Annabeth and Grover instead. / Percabeth AU

Annabeth Chase has never known who she is - what she is. Separated from her family eight years old by an evil curse cast by Lord Kronos, the only thing connecting her to her past is a necklace with a secret message. 10 years later, she sets out to find her past with the help of two con-men, and embarks on an adventure that will change the course of her life forever...

This is a Travis x Katie story and as you know it's based on the 1997 film 'Anastasia' maybe a film from your childhood memories :D.