Shawn and his best friend Burton "Gus" Gu ster (Dulé Hill) own a business called "Psych". They are able to stay in business only because of the cases they work with the Santa Barbara Police ...

As Gus and Selene prepare for their wedding and the arrival of their son, Shawn and Gus face the challenge of tracking down Selene's estranged husband, with Gus slipping into 'groomzilla' mode.