When the body of a young man is discovered deep beneath the icy waters of Lake Grant, a note left under a rock by the shore points to suicide. But within minutes, it becomes clear that this is no suicide. It's a brutal, cold-blooded murder.

All too soon former Grant County medical examiner Sara Linton - home for Thanksgiving after a long absence - finds herself unwittingly drawn into the case. The chief suspect is desperate to see her but when she arrives at the local police station she is met with a horrifying sight - he lies dead in his cell, the words 'Not me' scrawled across the walls.

Something about his confession doesn't add up and deeply suspicious of the detective in charge, Lena Adams, Sara immediately calls the Georgia Bureau of Investigation. Shortly afterwards, Special Agent Will Trent is brought in from his vacation to investigate. But he is immediately confronted with a wall of silence. Grant County is a close-knit community with loyalties and ties that run deep. And the only person who can tell the truth about what really happened is dead.