When a body is found on the bridge connecting El Paso and Juarez, two detectives, one from the United States and one from Mexico, must work together to hunt down a serial killer operating on both sides of the border.

Marco and Sonya investigate the body from the bridge. Frye learns that the Killer isn't done with him. Charlotte makes an unwelcome discovery on her property.

Sonya and Marco race to track down a prime suspect who could lead them to the lone desert survivor. Charlotte confronts an unexpected visitor determined to keep business as usual.

The clock ticks as Maria's broadcast continues. Sonya searches for the girl's location. Against protocol, Marco works a unique ransom angle. A powerful Juarez force crosses the border.

Sonya and Marco suspect a cover-up. Charlotte goes to Marco for advice. A troubled girl seeks adventure in Juarez. A visitor stops by Linder's apartment.

Sonya bonds with a key witness from the case. Marco uncovers secrets about Sonya and Hank's past. Meanwhile, Charlotte seeks help from an old friend.

The EPPD corners their prime suspect. Charlotte questions Ray's true intentions. Linder crosses the border and takes on his most difficult case yet.

Sonya pursues a cold lead despite Marco's insistence that it's a dead end. Charlotte finds out that Ray has jeopardized her ranch.

Marco reconnects with a friend from his past and races to save his family. Charlotte responds to her biggest threat. Linder reveals his true feelings.

Showdown on the bridge as the Killer reveals his endgame.

Sonya uses Linder's latest problem to repair her relationship with Marco. Charlotte forms an unlikely alliance.

Sonya and Marco search for a missing girl. Charlotte meets someone who knows too much about her new business venture. Marco makes a decision that could change everything.