We have all encountered people with mental illness in school, the workplace, among our friends, and in our families. If the emotional or mental distress is mild or non-threatening, empathy and compassion go a long way. Dealing with someone who has a personality disorder is another matter.

When Charlotte Yardley’s sister moved to her town after they had communicated mostly by phone for 40 years, she found herself ill-equipped to interact with someone whose behavior alternated between tears, depression, anger, blow-ups, and outright cruelty. She had thought they were close, but now she was being blamed for everything her sister believed was going wrong in her life. As Yardley dipped into co-dependence and depression of her own, she sought therapy.

Through journal excerpts, summaries of concepts from books she read, excerpts of her sister’s emails and therapy sessions, even a teacher-like handout, she invites the reader to join her in her journey toward acceptance of the kind of relationship she can and cannot have with her sister. Though the subject is dark, there is some humor, and there’s a section of quick tips at the end for those facing similar relationship struggles.