David Tennant stars in this drama as Will Burton, a highly talented junior barrister who is in great demand, having never lost a case, much to the frustration of his courtroom rival Maggie Gardner. But when his talents lead to the acquittal of Liam Foyle, who was standing trial for a high-profile murder, he has reason to regret his peerless legal skills. For Foyle is a serial killer - and before long he is on the hunt for his next victim.