TV

A murder probe doesn’t have the right smell, literally, for Laura (Debra Messing) and her colleagues as they investigate the murder of a perfume-industry titan in the new episode “The Mystery of the Downward Spiral.” As they work the case, Laura and Jake (Josh Lucas) try to come to terms with the status of their personal relationship. Stockard Channing, Jerry O’Connell and Willie Garson (“Sex and the City”) guest star. Callie Thorne also stars.