When a fellow NCIS agent is murdered during the investigation of a cold case, the others vow to solve the mystery and catch his killer.
Ted joins a dating agency with a remarkable success record in an attempt to meet the love of his life; Marshall and Lily wage war with a household pest that seems to be part mouse, part cockroach.
Meredith and Cristina bicker about their careers; Bailey talks to Ben about him moving back to Seattle; Shane puts himself in a risky situation; Derek receives a life-changing phone call.
Jane, Lisbon and the team investigate the murder of a fashion designer whose glamour has faded, while Darcy's continuing work on the Panzer case brings Jane's nemesis Red John back on the radar.
Castle and Beckett investigate the murder of a man stuffed down a rubbish shoot. Things get complicated when both his wife and fiancé come in to identify the body.