Escaping the demands of Paris police work, Commissaire Capucine Le Tellier embarks on a well-deserved Mediterranean cruise. But wherever the renowned inspector goes, murder is sure to be close on the horizon. . .

On the azure waters off the coasts of Corsica and Sardinia, what could be more relaxing and rewarding than traipsing around the Mediterranean enjoying the local culinary delights. Among the invited bon vivants are Capucine, her husband, the celebrated restaurant critic, her special agent cousin Jacques, a famed bar owner, and even her boss. To all appearances, the table is set for an affair to remember.

In the midst of this pleasure cruise, Natalie, the yacht's cook, is lost overboard. A sudden squall is the assumed cause. But once a bullet hole is discovered in her jacket, suspicions quickly shift and the onboard bonhomie suffers accordingly. When a shell casing is uncovered that matches the gun Capucine is authorized to carry, for the first time in her stellar career, the hardworking detective finds herself the prime suspect.

For Capucine, these are clearly not the deep waters she envisioned as part of her holiday. As the motives become murkier, the gifted Commissaire will need to harness all her powers of deduction to get to the bottom of the mystery--before she ends up at the bottom of the sea.