Summer is busy season for Mackenzie "Mac" Almeida's bicycle shop, nestled in the quaint, seaside hamlet of Westham, Massachusetts. She's expecting an influx of tourists at Mac's Bikes; instead she discovers the body of Jake Lacey. Mac can't imagine anyone stabbing the down-on-his-luck handyman. However, the authorities seem to think Mac is a strong suspect after she was spotted arguing with Jake just hours before his death. Mac knows she didn't do it, but she does recognize the weapon--her brother Derrick's fishing knife.

Mac's only experience with murder investigations is limited to the cozy mysteries she reads with her local book group, the Cozy Capers. So to clear her name--and maybe her brother's too--Mac will have to summon help from her Cozy Capers co-investigators and a library's worth of detectives' tips and tricks. For a small town, Westham is teeming with possible killers, and this is one mystery where Mac is hoping for anything but a surprise ending...