In the Pacific Ocean, a Silicon Valley magnate vacationing on his luxury motor yacht Carpe Diem, stumbles across a floating island of pumice.
Two weeks later, the motor yacht returns to its home port in San Diego on autopilot but when it arrives, nobody disembarks.
Sam Reilly and his team are called in to investigate what happened on board Carpe Diem. But what at first appears to be a simple boating accident soon turns into a deadly game of international intrigue sending America and Russia racing toward each other on an unavoidable collision course.