"Probably Miller's best thriller yet."

A woman's scream. A muzzle flash. The crack of a gun.

Sasha McCandless knows she's just witnessed a murder on a nearby fishing boat. But when she reports the crime to the captain of the luxury cruise ship she's sailing on, he dismisses her as a hysterical woman.

And just like that, Sasha and Leo's adults-only, romantic cruise turns from rest and relaxation to an unauthorized investigation into a crime committed in the Gulf of Thailand, outside the jurisdiction of organized law enforcement.

Sasha and Leo will take matters into their own hands to bring down a violent maritime crime ring, but ripples from the incident will follow them home like waves on the ocean.