Here are the episode descriptions for the last 3 episodes of this season.
4.14 – “Think Tank”

Shawn and Gus are thrilled when they’re asked to join an elite security company, but the team to which they are assigned are not quite as thrilled with their unconventional techniques and the affect it has on their latest assignment: preventing the assassination of a billionaire executive.

4.15 – “The Head, the Tail, the Whole Damn Episode”

When Lassiter maintains that a shark attack is really a planned murder to much skepticism at the department, Shawn and Gus eventually take pity on him and set out to help him prove the crime.

4.16 – “Mr. Yin Presents…”

Mr. Yang makes good on her promise to return, and this time she’s in a cinematic frame of mind as she tests Shawn’s knowledge of Hitchcock films and lore in return for clues to the puzzle she’s set.