Mabel & Oliver begin investigating Arconia's West Tower and get trapped inside an ominous game. Meanwhile, Charles is visited by two individuals from his complex past.

Charles, Oliver & Mabel begrudgingly pair off with new investigators... actors Eugene Levy, Zach Galifianakis & Eva Longoria.

Charles, Oliver & Mabel delve into the particular universe of stunt people. They encounter a suspect with an incredibly... familiar... face.

A documentary film is made by The Brothers Sisters.

Terrified by a threat inside the Arconia, the trio race out of the city. A member of Charles' family provides refuge and yet, this safe house proves to be anything but.

Charles, Oliver & Mabel combine forces with the film actors in an epic showdown against the Westies. You can't handle the truth.

The final answers to our season are revealed - but not before the trio faces mortal danger and an Arconia wedding.