A locally born SWAT sergeant, former Marine Daniel Hondo Harrelson (Shemar Moore), is newly tasked to run a specialized tactical unit that is the last stop in law enforcement in Los Angeles, on the series premiere of S.W.A.T.

After receiving a mysterious tip from her past, Beckett is launched into a fight for her life, with a team of mercenaries hot on her trail. As Castle investigates why his wife is on the run, Beckett must figure out who wants her dead, before they can finish the job.