When one of the members of The Lyme Regis Women’s Swimming Club takes on a new job cleaning holiday lets, she expects her biggest challenge to be working her way through six cottages before the next guests arrive.

She doesn’t expect a mystery.

Why is a picture in one of six identical cottages very slightly different to the others? Who is the mysterious woman who let herself in and cleaned before Rosamund got there? And what’s that awful smell in cottage number one?

As Dorset Police investigate two murders they suspect of being connected with organised crime, Rosamund’s mysteries may be more serious than she thinks. Will she and her swimming buddies be about to solve a double homicide?