It's summertime but not everyone is having a vacation. The owner of Sunny Side Realty is found buried in a bath of cement. Holly and the gang dive into the investigation, except Holly is distracted when she spies Trent on a date with her nemesis, Millicent Monroe. After failed undercover operations, they have one final attempt to figure out the identity of the murderer. Millicent and a Great Dane with social anxiety might be Holly's only hope when she goes off the grid. Who's next to cool off with a deadly dip?