A rainy July weekend in Westham means the beaches are empty and business is dead at Mac's Bikes but couldn't be livelier inside the Rusty Anchor Pub. But come Monday morning one patron is not so lively when the chef opens up and finds a body behind the bar. It's last call for Bruce Byrne, an elderly high school teacher who's been around so long it seems like he taught everybody.

When Mac's friend Flo, the librarian, makes the list of suspects, Mac gathers the Cozy Capers Book Group to clear her name. With no end in sight to the rain, the group has plenty of time to study the clues and sort through a roll call of suspects to determine who decided to teach Mr. Bryne a lesson. But with a killer desperate to cover their tracks, Mac and the group will be tested as never before . . .