James and Carmona Hardwick are spending the summer playing host to numerous friends and relatives in an old Hardwick family residence by the sea.
The arrival of Alan Field, a devastatingly handsome though shady figure from Carmona's past, destroys the holiday atmosphere in the old house and replaces it with a mounting tension, culminating in murder.
Fortunately, Miss Silver is present to unravel the complex mystery and seek out the murderer amongst them.