When Rookie Blue concludes its fourth season tonight, expect to see an “intense”; and action-packed hour sure to keep fans on the edge of their seats.

In the concluding hour of last week’s first installment of the two-part season finale, the officers of 15 Division put everything on the line to track down the unpredictable suspect who’s kidnapped Officer Oliver Shaw (Matt Gordon) before it’s too late.

In an interview with The Hollywood Reporter, Rookie Blue shorunner Tassie Cameron reveals fans can expect a “big, exciting, emotional”; finale that may cost 15 Division one of its key officers.

“We wanted this to become a dangerous, emotional crucible for everybody,”; says Cameron. “Going with the idea of the theme of this episode that in times of great stress and chaos, often the truth is revealed, so we tried to play that out in everybody’s storylines in major ways and minor ways.”;

Cameron also hopes viewers will find tonight’s season finale to be “gut-wrenching. It was to write it. I think it was for the actors to shoot it. I think that Missy Peregrym would say that there’s a big moment in the last act that was probably one of the hardest [scenes] for her to shoot since we started the show and certainly was one of the hardest ones for me to write. You start constructing an episode with key scenes in your head and that was always one of them. I think it is gut-wrenching for everybody.”;

The season finale of Rookie Blue airs tonight on Global.