Summer has come to the Lake District town of Windermere, where Persimmon 'Simmy' Brown runs her own florist shop. But there's no time for her to stop and smell the roses with the shop struggling for money, so a contract to provide floral displays for a hotel in Hawkshead couldn't have arrived at a better moment. However, Simmy's association with the hotel soon turns sinister when she finds a body in the lake.

To make matters worse, her friend, Ben Harkness - responsible for calling and alerting her of the discovered body - is now missing and thought to be kidnapped. Caught up in both a murder and kidnapping investigation, Simmy begins chasing clues left by the missing Ben.

With many suspicious characters bustling in and out of the hotel, while simultaneously trying to cope with her father's encroaching dementia, solving the puzzle seems a grueling challenge, but Simmy is compelled to uncover the truth...