Kronos amasses enough power early on to send an infant Percy back in time. Finding this development unsuitable, the Fates interfere, and only the soul of Perseus is sent back, while his body remains in the present occupied by a fake soul. Now, what is Percy doing in the past as he works his way back to the present? Eradicating the Templar Order, of course.
A young Assassin is destined to help the children of the greek gods win a war that may kill them all. But first, he must relive the memories of his past lives to hone his skills in order to fight the supernatural, while eradicating the Templar Order that seeks to enslave those he cares for.