When Allison Mann first heard about the case, she was a paralegal. The story left a big impression on her: after an ugly divorce, the two teenage daughters of David Rucki and Sandra Grazzini-Rucki vanished. David, their father, started to investigate every lead he could. Sandra, their mother, went on vacation. Allison knew what a lot of people don’t—that missing children are far more likely to be kidnapped by someone they know. While some adults worked tirelessly to find out what happened to the girls, others conspired to keep the truth hidden.