When ATF informant Christine Elkins mysteriously disappears before she can help put away drug dealer Tony Emery, authorities suspect she is dead.

However, there is no body, no blood, no weapons and no witnesses. Two agents spend eight years following lead after lead, encountering nothing but dead ends. Then finally, a routine interview yields the break they have been searching for. The quest to get their man takes police to a number of unlikely places - including the bottom of the Missouri River.