Despite a traumatic childhood in Cold Creek, Ohio, the Lockwood sisters have reunited there for the wedding of youngest sister Tess to the town's sheriff. Maid of honor Kate Lockwood is determined to break through best man Grant Mason's defences. An anthropologist, Kate makes her living studying the dead. She is particularly interested in the prehistoric Adena civilization that once called the area home. A large burial mound sits on Mason family land, and Kate wants permission to excavate. But Grant refuses and tells Kate to stay away from the mound.
Kate respects Grant's desire to honor his grandfather's belief that the dead should not be disturbed. However, the more she researches the more it becomes clear that Grant is hiding something. When one of Grant's friends is killed—and the sheriff is away on his honeymoon—the couple joins forces to assist the deputy in the investigation.
When Kate comes under attack she is certain it is connected to the burial mound. Grant seems concerned for Kate's safety, but despite their explosive attraction she can't help but be suspicious of his motives. Can Kate trust the man she's come to love, or will the wrong decision be her final act?