The first six episodes of the BBC drama thriller series starring James Nesbitt as a modern Dr Jekyll, with an old problem: Mr Hyde. But the two have a deal - a body to share - and an impossible life is somehow lived. What Hyde doesn't know is that Jekyll is married, with a wife and two children he'll do anything to protect from his dark side. With all the resources of modern technology, and the best surveillance hardware, he's determined to keep his dark side in line. He's done a deal with his own devil. What neither of them knows is that an ancient organisation, with limitless wealth and power, is monitoring their every move, and a plan that has been over a century in the making is coming to fruition... Michelle Ryan, Gina Bellman, Denis Lawson and Meera Syal co-star.