Warthogs?

The war with Gia is over and all seems peaceful. Or is it? When Hectate appears on the Argo II and asks Percy, Nico, and Thalia to come help fight a wizard war and protect a boy named Harry Potter, the trio prepare for the journey. What will Harry, Hermione, and Ron think? Will they be able to stay undercover for long? Will Voldemort finally be defeated?