Excellent book - one all couples should read I’d say regardless of poly-status. It helps shrug off the BS around relationship structures adding “security” when they obviously don’t as in evidenced in divorce rates, rates of monogamous couples that feel alone, insecure, etc.

Besides being a rare resource for the non-monogamous community it’s a clean look at how attachment-theory relates to a relationship of any structure, where many other books miss the mark in unhealthy ways.