For some, the question comes when they wake up one morning, look at the person sleeping next to them, and realize—all at once, for the first time, but with unambiguous clarity—that they no longer want to be married. For others, it’s a glance in the mirror at a face lost beneath years of self-neglect. Or the bank foreclosing on the house. Or a body that has lost its strength.Most people experience a singular moment when they pause to take a hard look at their lives and don’t recognize what they see. For Alice Humphrey, that sobering moment came when she saw Drew Campbell’s body being carted through the narrow gallery door to a medical examiner’s van waiting at the curb.An ambulance had previously arrived, just after the first marked police car. But the paramedics hadn’t bothered moving the body. Drew was that dead. Now his body was simply evidence. She felt herself flinch as the side of the metal gurney bumped the door frame.That was the moment.And, like anyone confronted with the fact she had been living a life she couldn’t recognize, she asked herself, How did this happen?