How well do you really know the person you love? How far would you go to find out? If there were one person in the world Dr. Lauren Chambers was sure she could rely on, it was her beloved husband, Michael. Recovering from an agoraphobic depression and prone to episodes of blinding anxiety, Lauren is a gifted psychologist for whom her husband & rsquo;s love and support mean everything. So when Michael suddenly and mysteriously vanishes, Lauren once again finds herself balancing on a knife & rsquo;s edge, haunted more than ever by an all-too-familiar paranoia. Is there more to it than paranoia, though? Private investigator Nick Bradley believes so. As the pair takes off on a cross-country journey in search of answers & mdash;a search that yields a series of unsettling truths about the husband Lauren believed she knew so well.