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It was written for people who are married to mentally ill, vindictive spouses (or ex-spouses) and have to go to court for divorce, child custody, or to protect themselve from false, malicious accusations of violence.
The issues covered in the book are remarkably similar to what you're up against if dealing with a family member who has been sucked into a cult and is waging legal war against you.
Its a good, cover-your-ass guide.
Not all lawyers understand the kind of situation you're in. So I recommend this book just in case you have to get some legal aid to protect yourself.