Treachery is afoot on the 'Genesis', a cargo ship at the very edge of human space. When Silvia Tanner opens herself up for "a bit of honest corruption" with the Sontarans, she finds she has bitten off more than she can chew. With a Sontaran aboard and the sudden unexpected arrival of an investigator calling himself 'Alex', the stakes are suddenly raised higher than before, and secrets will out. What is the Sontaran plan and why do they need the ship? Who is Alex and who is he working for? With time running short, Silvia needs to unravel the mysteries fast, and tell her enemies from her friends.