Shawn's powers of observation work against him when he cannot help but reconcile his gorgeous Friday night date with her ex-boyfriend after solving the mystery of his series of white lies. Now alone in a bar, he spots Lassiter at a table, drinking heavily, marking a sad anniversary. Lassiter invites Shawn over and proceeds to pour his heart out, confessing that Shawn's skills astound him. While he doesn't believe he's psychic, Shawn somehow guarantees an arrest, whereas Lassiter, who used to be a great cop, now can't even solve the murder of a local astronomer. Everyone thinks Bryant Vallery died of natural causes, but the guy was relatively young and lived a healthy lifestyle. Lassiter tells Shawn that he knows there's more to it but can't prove it - then proceeds to pass out.
Spoilers ahead. Coverage follows the scope labeled below.
Complete story — includes the ending
Shawn talks with Detective Lassiter at a bar, and gets details on the potential homicide of an astronomer. Lassiter is depressed about the fact that he has not been able to solve a crime in a while, so Shawn decided to solve the case, but credit Lassiter with everything. Shawn gets a job at the observatory where the man worked, and surprises Gus, who visits the building frequently. Shawn breaks into the astronomy lab, looks through the log books, and discovers a missing page. He realizes that the other astronomer likely killed his co-worker. Shawn and Gus try to break into the man's house; while there, they notice a weird flower, and decide to take it. Gus discovers that the living astronomer is about to announce something big. They find out the flower is toxic, and Shawn realizes that this was how the man was murdered, and they catch the man.