Patterns in Bloomington, MN

A woman goes missing, taken by a serial kidnapper whose exacting pattern of degradation and torture brings his victims to the brink of death. Each woman is returned to her loved ones just before she topples over the edge. One woman per state. This time the victim is Detective Carmie Mansuer's boss. Where in Boston is the abductor's black hole? Clues are few and time is short.