Unit 42

On his first day back from leave, widowed cop Sam is called to the scene of a young woman's murder, where he clashes with rookie tech whiz Billie.

A graphic assassination video posted online leads the team to a network of ISIS recruiters in a case that strikes a nerve for Nassim.

When a hidden camera in the woods captures the slaying of a hacker known for exposing corruption, Billie tries to conceal her link to the victim.

While investigating an unsettling murder at an apartment used by S&M aficionados, Sam becomes obsessed with daughter Emmy's new boyfriend.

When two well-known drug traffickers turn up dead, all the evidence points to Bob. But Sam refuses to believe his colleague is a killer.

The kidnapping of an industrial tycoon leads to disturbing revelations about his company -- and an online "trial" to decide his fate.