Preston and Porter move out; Gaby and Carlos visit her hometown; Keith asks Bree to move with him to Florida; Susan uses her ailment to get special treatment; Paul makes a decision about Beth.
Meredith and Lexie's father returns to Seattle Grace with stomach pains and a new girlfriend; Alex butts heads with the new OB; Mark bribes Jackson for information on Lexie.
Reese inadvertently perfects Malcolm and Stevie's science experiment, but he can't remember how he did it. Dewey thinks of reasons to convince people to buy the candy he's selling.
Grissom, Warrick, and Sara investigate when a woman vanishes while taking part in a magician's act. (TV-PG)
An unreliable witness and an overzealous detective hinder a murder investigation; a con artist scam leads the squad to a sex-slavery operation; McDowell agrees to join Sipowicz and Theo at a theme park.