Percy Jackson, Grandson of Tom Riddle

The war is over but the casualties are numerous. Among them are Frank, Hazel, Jason, Piper and Nico. Percy, Annabeth and Leo, the survivors, are all devastated at the loss of their close friends but the deaths don't end there.

Percy gets invited to Olympus to receive a reward from the gods. He asks them for a normal life and the gods do their best to give him one. He ends up turned into a 12-year-old. Then Hecate notices his wizard side and suggests a trip to London. He decides to go since Zeus promised not to shoot him down. There he learns of his heritage and reseives a letter sent with an owl...?