Smithy picks up a lead on a drug dealer operating from a burger van and before long Sun Hill's uniform branch are mounting a raid on a cannabis farm - where Diane puts herself in great danger by ignoring Callum's orders. Back at the station, Phil and Stuart muster as much empathy and sensitivity as they can when CID are called on to sort out a love triangle and find a missing bridegroom in time for his wedding. Beth and Tony attend a domestic disturbance.