Leo, lacking powers and feeling useless, cleans up the attic to impress Piper, but she worries about him, believing that he is obsessive. He has found a doll house, a small model of the manor. A demon shimmers in, throws a sharp-edged boomerang, and disappears. The boomerang grazes Leo, and Piper is worried; but Leo refuses to hide. Piper goes to Paige with the boomerang and asks her to scry with it.
Paige goes to Phoebe and she tries to claim a family emergency; but Elise has other plans. According to her, she has a family emergency and her top lieutenant Richard Dillard is out sick (it turns out they're planning a night out) and she leaves Phoebe in charge of the newspaper.
Demons attack at manor. One throws a boomerang and it wounds Leo in the back. Wyatt sees, and transports Leo and Piper into the doll house in miniature form. The doors and windows are magically blocked. Piper tries to blast to get Paige's attention, but in vain, Paige takes Wyatt and Chris to Magic School.
Zankou flames into the apparently empty manor, followed by a dozen demons. They spread out and look for the Nexus.
Paige tells Phoebe that Piper is missing. They orb into the manor, but find Zankou and his minions there, and he blasts them out the front door.
Piper finds where the doll house parts for playing, and blasts; she and Leo escape, and try to consult the Book of Shadows.
In the basement, Zankou opens the Nexus. The Shadow comes out, but instead of entering Zankou, it destroys three demons and retreats. Zankou realizes that Piper is still in the manor.
Piper blasts the Book of Shadows to find a scrying spell. She uses it in reverse to draw the attention of Paige and Phoebe, but the blasting also draws the attention of two demons. Paige and Phoebe orb into a bathroom and fight their way to the attic -- but Zankou greets them, with miniature Piper and Leo in a box. Paige and Phoebe bluff Zankou, claiming that he needs the Power of Three to open the Nexus. Zankou restores Piper to full size, retaining Leo as leverage.
Zankou and the Charmed Ones enter the basement, Leo still in the box, and the sisters open the Nexus. The Shadow, however, enters Leo, restoring him to full size, since he's the only neutral being in the manor. He blasts Zankou, who flames away. Leo asks the sisters to take the Shadow out of him; they say a spell, and the Shadow returns to the Nexus.
The sisters talk Leo into taking charge of Magic School.