Eight years ago, James McCready was convicted of killing his partner, Gary Meadows. But McCready has always claimed that the stabbing was a tragic accident and, when fresh evidence comes to light, he wins his appeal for a retrial.

Detective Inspector Pat North is assigned to the reinvestigation. But when North discovers that her partner, Detective Superintendent Mike Walker, led the original police inquiry, their fledgling relationship is put to the test - particularly when she starts to suspect that he is covering something up.

Could Walker have tampered with evidence to frame an innocent man? And if so, who is the real killer?