If you had the power over life and death, what would you do?

Thea has a secret. She can tell how long someone has left to live just by touching them. Not only that, but she can transfer life from one person to another - something she finds out the hard way when her best friend Ruth suffers a fatal head injury on a night out. Desperate to save her, Thea touches the arm of the man responsible when he comes to check if Ruth is all right. As Ruth recovers, the man quietly slumps to the ground, dead.

Thea realises that she has a godlike power: but despite deciding to use her ability for good, she can't help but sometimes use it for her own benefit. Boss annoying her at work? She can take some life from them and give it as a tip to her masseuse for a great job. Creating an 'Ethical Guide to Murder' helps Thea to focus her new-found skills. But as she embarks on her mission to punish the wicked and give the deserving more time, she finds that it isn't as simple as she first thought.

How can she really know who deserves to die, and can she figure out her own rules before Ruth's borrowed time runs out?