Several important events have taken place at the Chamberlin House:
Derek snooped for information for Alec.
Emma recognized Annie in a photo with Phyllis that was hanging on the wall.
Ethan and Sutton sneak into and search the house, and discover an incriminating of Alec holding the murder weapon from the night of Derek's death.
Rebecca and Alec's wedding is held in the backyard- at which Alec is arrested, and it is revealed that Sutton is aware that Rebecca is her birth mother.
Rebecca and Sutton rendezvous and scheme together.
Jordan tries to flee from Rebecca's control, but doesn't. It's here we find out he did something terrible in L.A.
Jordan discovers Rebecca hiding something in a box and then watches her lock the box in a file cabinet.
The potential killer was found running out of the house while knocking over Mads and running from Jordan.
After getting a warrant from Alec, Rebecca receives a call to pack a bag and leave home. She leaves just in time for Dan and his co-workers to bust in to arrest her, but she is already gone when the get there.