A chance for travel journalist Lo Blacklock to recover from a traumatic break-in that has left her on the verge of collapse.

Except things don't go as planned.

Woken in the night by screams, Lo rushes to her window to see a body thrown overboard from the next door cabin. But the records show that no-one ever checked into that cabin, and no passengers are missing from the boat.

Exhausted and emotional, Lo has to face the fact that she may have made a mistakeeither that, or she is now trapped on a boat with a murderer...