No one expected Lord Voldemort to have a grandson, not even his grandson. It doesn't help that he's one of the most powerful wizards in existence. His name? Percy Jackson.

|#2 in #voldemort| |#35 in #percyjackson| For all the roles he had played, a spy was not one that Percy Jackson expected. After returning home from the Giant War, Percy discovers that he has another evil grandfather: Lord Voldemort. And the Dark Lord will do anything to get the most powerful demigod alive on his side. The Order of the Phoenix extends their protection to Percy on one condition: he has to join his grandfather's side as the Order's spy. (You can choose whether to interpret part of this as Wolfstar) Disclaimer: I don't own PJO, HoO, or HP series; I own only this plot

When Dumbledore discovers the grandsonson of voldemort, things start to get a little weird. He didn't mean for it to happen, it just did! Percy didn't want to be the grandson of another old cart who wanted to take over the world, it just happened. What happened when Percy goes to Hogwarts?