This was meant to be the perfect trip. <p>The Northern Lights. A luxury press launch on a boutique cruise ship. </p> <p>A chance for travel journalist Lo Blackwood to recover from a traumatic break-in that has left her on the verge of collapse, and to work out what she wants from her relationship. </p> <p>Except things don't go as planned. </p> <p>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. </p> <p>Exhausted, emotional and increasingly desperate, Lo has to face the fact that her sleep problems might be driving her mad or she is trapped on a boat with a murderer - and she is the sole witness...</p>