Daniella and Aidan work on a gruesome case in the season finale. When they investigate the murder of the husband of a well-known human-rights lawyer, the evidence leads them to the horrifying world of psychopathy. CBC, 9 p.m.
When Reid discovers that his girlfriend has been kidnapped by her stalker, the team rushes out to find her before it's too late. Michelle Trachtenberg guest stars as Diane, a genetics research assistant. CTV, 8 p.m.
After a priest is killed, the team tries to track down the person responsible for the crime. Their search leads them to Natasha, who acted as a criminal informant on another case. Meanwhile Agnes and Clark's mother goes missing. CBS/CTV, 9 p.m.
George Stroumboulopoulos: Kristin Scott Thomas
Jay Leno: Halle Berry, Rachel Maddow
David Letterman: Jim Carrey, Richard Thompson
Jimmy Kimmel: Mark Wahlberg, Andrea Riseborough
Craig Ferguson: Selma Blair, Nathan Fielder
Jimmy Fallon: Ice-T, Chris Hardwick
Conan O'Brien: Russell Brand, Of Monsters and Men