After pondering a marriage proposal from Cole, Phoebe is forced to face a blast from his demonic past when the widow of one of his past victims hunts him down, looking for vengeance. As a result, they're forced to face an old protégé of Belthazor's who likes to kill witches with the same athame Cole used to use. However, when Paige learns of this, she has an instant mistrust of Cole and tries to convince her sisters to vanquish him. Meanwhile, Paige helps Leo and Piper find out whether they're ready to have kids.