Message on the Tide

On an innocuous morning walk along the beach, Darcy Harmon stumbles upon a sealed bottle containing letters from the past, sparking her curiosity and a desire to uncover the mystery. While her sister Emma, an amateur sleuth, initially attempts to take over the investigation, Darcy is determined to solve it on her own. However, when her life is threatened twice, she reluctantly seeks help to unravel the secrets hidden within the enigmatic letters.