The Montauk Steps — Diane Sawyer

Ripe for large-scale development, Big Shell Island is locked in a battle between preservationists and construction companies. Currently, the historic and mysterious island is the site of an archaeological dig for lost Native American artifacts. Artist Annie Devane agrees to be part of the team, despite conflicting feelings about expedition leader Matt Revington. He's charming and dedicated, but she suspects this scion of a powerful and mistrusted family is hiding secrets. There is something buried on the island that will change its future. And Annie wants to know what.

Alone with people she's not sure she can trust, Annie discovers a maze of caverns, tunnels and danger. As she unearths the real motive for the dig and the stunning truth at its heart, she pursues a terrifying trail of murder that leads back to her own tragic past. And a waiting killer....