The Mysteries of Laura: Tate Donovan Gets Tough as a Brooklyn Detective (VIDEO)

Emily Aslanian
Barbara Nitke/NBC

Tate Donovan (24: Live Another Day) stops by The Mysteries of Laura in Wednesday's episode, "The Mystery of the Unknown Caller."

Donovan plays the tough Detective Malcom Harris of Brooklyn’s 82nd Precinct, from the looks of the exclusive clip below, things are about to get messy between him and Detective Laura Diamond (Debra Messing).

This episode also marks the first of a two-parter starring Disney Channel darling Debby Ryan (Jessie) as Laura's half-sister, Lucy. When Lucy ends up on the prime suspects list in a murder case, Laura must work to keep Det. Harris off her sister's tail. This might prove difficult, considering Laura can't seem to find her sister either. And according to big sis Laura, Lucy is a "liar, a mooch, a butthead, but she's no murderer."

Watch Laura and Det. Meredith Bose (Janina Gavankar) meet the no-nonsense Det. Harris below.

The Mysteries of Laura, Wednesdays, 8/7c, NBC