Psych: Season 4, Episode 11

4 - 11: Thrill Seekers & Hell Raisers

Gus reveals his new girlfriend Ruby (Sarah Shahi) to Shawn, who hasn't forgotten Gus' poor track record with women - he drunkenly got married to 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.