When local rock climbers stumble upon abandoned human bones in a remote Texas gorge, Sara Lockhart is the first to get the call. She has a reputation as one of the nation's top forensic anthropologists, and police detective Nolan Hess knows she is just the expert he needs to help unravel this case. Although evidence is scarce, Nolan suspects the bones belong to a teenage climber who vanished last summer.

Discovering buried evidence makes her a target. At a prehistoric site, forensic anthropologist Taya McGill uncovers a recently buried body days before Christmas--and finds herself in a killer's sights. Now on the run with undercover ATF agent Keegan Stryker, she must rely on him to guard her as they figure out why someone would kill to keep this murder unsolved. But can they unearth the truth before someone silences them both for good?

When skeletal remains are found on a small Maine island, forensic anthropologist Lydia Muir is sent to investigate. It is Lydia's job to dtermine whether the homicide happened long ago--or more recently. Island sheriff Wesley Grant seems sure the murder didn't happen on his watch. But when Lydia uncovers the victim's identity, someone goes to great lengths to get Lydia off the island. Wes vows to protect her, but is the handsome lawman holding something...