A killer who escaped justice on a technicality has moved close to the Hague and started killing people. Marco who investigated the original case is incensed, but then the case takes a strange turn when the killer is murdered.

The series taps into a fictional unit mandated by the International Criminal Court (ICC) to investigate cross-border crimes and ultimately bring global criminals to justice. Crossing Lines is set in the world's most exotic locales, where an elite team of eager cops work to solve the most notorious international crimes.