Benson and Calvin attend a Halloween festival while Amaro quibbles with his daughter. Rollins and Fin bust a pedophile who's handing out treats. Across town, Allie purchases organic diapers for her baby, Nate. When she returns to the parking lot, her car - and her baby - are gone. The SVU team learns that Tim and Allie are tourists. When Allie tells Tim what happened, he explodes into a rage. Tim tells Amaro he found a place on Craigslist, but when he got there, six tenants were already staying there.