In a nutshell, how we get treated by our caregivers as young children has a direct result on how we approach love as adults. The authors define the three most prevalent attachment styles--secure, anxious, and avoidant--and describe how people with these different styles approach relationships.
The book offers a quiz for you to figure out your own style, plus another to ascertain your partner's. It also goes into great length about how people with different attachment styles jell, e.g. anxious/secure can go together but anxious/avoidant cannot. (It's sounds a little bit like astrology. But there's real science behind it, I promise!)
Dr. Michelle Stevens is a psychologist, writer, and expert on trauma. She wrote the bestselling book, Scared Selfless: My Journey from Abuse and Madness to Surviving and Thriving (Putnam, 2017).