Eric's former associate preacher Tom Harrison arrives unannounced, accepts to stay with the Camdens but is told the church can't afford an assistant. Simon hears raising pets can earn well, but is suckered into buying a pair of ferrets, illegal in the state, and fails to keep them in check, failing proper instructions from the dodgy vendor. Mary stupidly befriends party-animal Camille, a new schoolmate, who shoplifts a dress for her and convinces her to sneak out to a frat party. Lucy, who took Tom's cue to compare religions before joining her father's confirmation course, covers for 'big' sister and Matt must come rescue her. Eric's suspicions about Tom are disproved spectacularly.