Amidst several personal revelations, Arch's investigation into Gallagher comes to a head when a murdered body washes up the shore. 

Arch and Fitz investigate Fitz's enemy, Premier O'Brien when he becomes the prime suspect in a bachelor party gone wrong.

When the severed finger of a handyman mysteriously turns up, Fitz and Arch's investigation turns into a case of vigilante justice. 

Arch and Fitz race against time to save a kidnapped flight attendant, and then one of their own.

Arch's investigation into Gallagher takes a turn when his son becomes the prime suspect after a dead body washes up at a music festival.

When an archaeologist winds up dead in her dig site, Arch and Fitz look into a group of academics to find the murderer.

Fitz and Arch work with a Newfoundland Officer from Fitz's past to apprehend an infamous bank robber who's escaped to Saint-Pierre. 

When a billionaire is found decapitated, Fitz and Arch dig into the victim's family. 

Fitz and Arch engage in a game of cat and mouse as they race to determine the target of an assassin on Bastille Day. 

New to town Inspector Fitz joins forces with local detective Arch to solve the murder of a back-to-nature group leader.