Percabeth; M.I.B wants to give us a job?

Percy has a troubled past on mortal record but when he is recruited by SHEILD for his marine biology expertise and his fighting skills he is overjoyed. Annabeth is recruited as an agent alongside him but is quickly admitted to the labs. They vow to keep the mythologic world a secret but what happens when they collide. Can they stay safe? Will the two be able to balance the life of a demigod and SHEILD agent? What happens when some strange cases fall upon them? What happens when old faces appear and our saviors find that destiny is not done with them? Will they be forced to leave their only hopes at mortal life?