National bestselling author Shannon K. Butcher returns with the electrifying fourth novel in her action-packed, romantic Edge series... The covert organization known as the Edge is in full rescue mode, having been ordered to find the victims of the dreaded Threshold Project--and also to bring Adam Brink into the fold. Brink previously worked for Threshold, and may know how to stop the terror. Mira Sage knows Adam's dark past. She's created a database of Threshold survivors whose lives were destroyed by the experiments of the twisted Dr. Stynger--and is driven to save them. If working with the duplicitous Adam will help her, she'll play along. Even as Mira secretly seeks to prove Adam is still a traitor, Adam has his own agenda that no one must discover. But when the two find their goals pointing in the same direction, Mira will be tested to believe in the one man she can't trust. The one man she can't resist...