Reviews the book, The Origins of Attachment: Infant Research and Adult Treatment by Beatrice Beebe and Frank M. Lachmman (2014). This book proves to be a difficult book both to read and to review, but this difficulty is not the fault of its authors, who have labored mightily to explain one of the most complex matters in all of psychology: how does a pattern of caregiver—infant interaction in early infancy (at age 4 months actually) become a caregiver—infant attachment style at age 1 year. Of crucial importance to this volume is the chapter in which Beebe and Lachmann describe the process of self- and interactive contingencies. Regarding the implications of mother-infant interactions for adult treatment, they propose an optimum midrange for interactive contingency, with coordination that is too high indicating vigilance and with coordination that is too low indicating withdrawal, each circumstance in turn connected to differing forms of insecure infant attachment (resistant vs. avoidant). They argue that these same considerations about the optimum midrange of coordination or contingency apply to the nonverbal or procedural aspects of adult treatment as well. Beebe and Lachmann further argue that self-contingency, the other focus of their research attention, is as essential to adult treatment as it is to each individual party in the mother—infant dyad. (PsycINFO Database Record (c) 2019 APA, all rights reserved)