Spring has brought many new beginnings into the world of florist Persimmon 'Simmy' Brown. Not only has her baby arrived, but she and her fiancé Christopher have moved to the historic village of Hartsop in the Lake District - and they still intend to say their vows before the height of summer.

But when a former acquaintance of Christopher's reminds him of a promise he made a decade previously, their lives soon take a sinister - and deadly - turn. Yet even with a young baby to consider Simmy cannot ignore her instinct to investigate, especially with the personal link to her soon-to-be husband. Ably assisted by her would-be detective friend Ben, can Simmy puzzle out this reckoning from the past and protect her family in time for the wedding bells to chime?