Percy, Annabeth, Thalia and Grover recieve a prohecy that leads them to Gotham city. The city rumoured to have been abandoned by the gods themselves. There they meet a young boy with dark black hair and bright blue eyes, a boy who looks suspisciously similar to Percy.

When Tiger returns to base with his now four foot tall partner, he is certain that Matron will force him out of comission. However, he is surprised when the young daredevil convinces her to keep him on the field. Now, Tiger will be forced to babysit a child while facing deadly trials. Will they survive, or will Tiger give up before they even leave the base?