From USA's official press release:

Shawn and Gus join up with a local firehouse to prove a series of arsons are more than they seem.

Psych stars James Roday as Shawn Spencer, Dule Hill as Burton "Gus" Guster, Corbin Bernsen as Henry Spencer, Kirsten Nelson as Karen Vick, Maggie Lawson as Juliet O'Hara, and Timothy Omundson as Carlton Lassiter.


Source: USA
(Image courtesy of USA)