S4, E15: While investigating the disappearance of Leah Robinson, a churchgoing suburban, stay-at-home mother of a 12-year-old boy, the team begins to suspect that she may not be as innocent as her husband and minister think she is. Leah was last seen leaving a Manhattan gallery opening with a man who was arguing with her. Leah's husband, Ken, is stumped as to the man's identity and Leah's reason for being in that city event.