Lost

He was considered a hero. She was considered dead. He was everywhere. She was hidden.

Not many knew of this, Percy Jackson has a twin, a lost twin. Zaylee Jackson was kidnapped and hidden at the age of five. Not a trace could be found to help find her. She was pronounced dead by the gods.

When Percy and Annabeth goes down to the underworld, he finds his long lost sister and she has been in a deep slumber since the day she was lost.

After Zaylee's 11 years of slumber, she has been woken up to a world of demigods. She has been seeing every little thing her older brother has done. Zaylee wasn't sure how, but she has. She knows what has been happening for the past 11 years.

With Zaylee's powers and knowledge, the demigods will beat Gaea with no doubt. Sworn to the gods that she will put personal issues behind everything else until the war ends. What if something happens that will change her mind, or better yet someone.