 The Halliwell manor is broken into, which worries the sisters about demons and Darryl about criminals. Cole learns from the Triad the burglar is Troxa, an invisible demon which they send out as he seems to make progress too slowly, and decides to counter his rival. Prue devises a magical crystal trap around the Book of Shadows, but Cole doesn t know that when he tries to find Troxa inside. Meanwhile there s a mortal assailant after Prue as well...