The Girl Behind the Door: A Father's Quest to Understand His Daughter's Suicide is a poignant memoir by John Brooks, detailing his journey to comprehend the tragic loss of his adopted daughter, Casey. Adopted from a Polish orphanage at fourteen months old, Casey appeared to thrive in her new life in Northern California. However, at seventeen, she took her own life, leaving her parents in profound grief and confusion.

In his quest for answers, Brooks delves into Casey's early abandonment and the potential impact of attachment disorders—conditions often affecting children who have experienced neglect or trauma. He consults experts, reviews research, and reflects on their family experiences, seeking to understand the underlying factors that may have contributed to Casey's struggles.

This memoir not only narrates a personal tragedy but also serves as a resource for adoptive families and mental health professionals. It sheds light on the complexities of adoption, the significance of early childhood experiences, and the critical importance of recognizing and addressing attachment issues.

The Girl Behind the Door has been recognized for its candid exploration of sensitive topics, winning the Benjamin Franklin Silver Award for Parenting and Family Issues. Brooks's heartfelt narrative offers valuable insights into the challenges of adoption and the profound impact of early emotional bonds on mental health.