The rain lashed against the windshield of Clara’s SUV as she pulled into the driveway of her sister’s suburban home. She had been there for six hours, dutifully watching her niece and nephew while her sister, Sarah, claimed to be at a “late-night corporate gala.”

Clara had felt a strange unease all evening. Her husband, Mark, hadn’t answered his phone in four hours. He said he was working late at the office, finishing the merger that was supposed to “change their lives.”