Saving Private Leo

Two ghosts from Leo's past come back to haunt him, and they find the best way to hurt him is to go after his charges and the people he loves. After sixty years of searching, the two ghosts, brothers who enlisted beside and fought alongside Leo in World War II come after him seeking revenge because they felt he abandoned them. When they stab him and learn he is a whitelighter (whom they believe they can't kill), they turn this raging wrath on his loved ones and kill one of his charges, a school teacher destined to become a whitelighter herself, then after some maneuvers and counters, including a period when Leo loses his powers, they seek out and stab Piper in the manor's attic, so Phoebe and Paige must face the horror of losing another sister while futilely attempting CPR with a bleeding corpse. Without his powers, Leo is vulnerable and unable to save Piper, who becomes a ghost, but this proves to be a mistake for the evil ghosts: in her ghostly form, Piper is able to recite the Ghost Vanquishing Spell (a spell only another ghost can say) and destroys the Lang Brothers' spirits. After being reminded of all the good he's done, Leo's powers return and he's able to heal and resurrect Piper before her spirit moves on. He and Piper later go to the reunion of the battle Leo died in with Leo pretending to be his own grandson, and Leo finally learns to forgive himself for his mistakes after he meets all the people he saved in that battle, including the man he died saving who survived thanks to his sacrifice. Meanwhile, Cole Turner is taking up a prominent position in a law firm dominated by the demonic underworld, establishing himself in a fancy new house and continuing to keep the secret that he's come into the powers of the Source of All Evil and is the new source. He interviews for staff positions and hires the Demoness Julie who would love to work under the Source much more closely and often.