As the owner of Mystery Cup Café in Wilton, Missouri, a town made famous by a string of long-ago murders, Blake Harper is used to the mysterious. When her barista is found strangled in a mound of coffee beans, Blake vows to find the killer, even though her sister, the town's lead police detective, tells her to stay out of it.

Blake finds plenty of suspects, like the owners of a rival coffee shop and the handsome new bookstore owner. But when new threats are made, she soon realizes the danger is centered around Mystery Cup and someone is targeting her personally.

Will Blake be able to solve the murder, find a new barista, and perfect her recipe for espresso brownies before she becomes the next victim?