Cole is after the Nexus beneath the mansion;he must first own the house.He replaces Phoebe with a shapeshifter who convinces Piper and Paige that the only way to solve their problems is to sell the house.
Phoebe,wants to mover on with her own life;she signs a lease for a new apartment,and Paige considers moving in with Henry.However a demon shrinks the sisters and traps them in a replica dollhouse of the Manor.
