While attending a funeral in nearby Badin, Peggy Lee (part-time forensic botanist, detective's widow, and owner of the Potting Shed) learns of the death of a diver performing routine work on the local dam. Then, days later, a woman's body is recovered from the swimming pool of a Charlotte home. When the bodies surface, so do the clues - including an unusual plant wound into the woman's hair. The police call forensic botanist Peggy Lee to the scene, but her findings only raise more questions. What do these two deaths have in common? And how did duckweed end up in a pool?