Plot summary
Gus reveals his new girlfriend Ruby ( Sarah Shahi ) to Shawn, who hasn't forgotten Gus' poor track record with women – while drunk, he married a crazy woman in 1997 – but immediately takes a liking to Ruby. Shawn and Gus join Ruby and her friends ( Stacy Keibler and Steve Howey ) on a river-rafting trip, and when one of them goes missing, Shawn figures out two things: it was no accident, and Ruby was somehow involved. Gus learns the truth, and is soon put in a compromising position.
Credits
Adapted from Wikipedia contributors, Psych season 4. HTML formatting and reference markers removed.