The gang heads to a casino resort to celebrate Lassiter's wedding, but leave it to Lassie to turn his bachelor party into a case when a crime boss threatens the nuptials.

Juliet finds something in Shawn's suit jacket that causes he to question Shawn, prompting him to come clean. The information, however, is too much for Juliet to handle, and it leaves Shawn and Juliet's relationship hanging in the balance.