It was time to call the police again. Robert Jeangerard had been missing for eight hours on May 19, long enough for his wife, Margie, to realize that this was not one of those times he would find his way home on his own. Since the first signs of Alzheimer's appeared seven years ago, he often wandered from their house in the San Francisco suburb of San Carlos on impromptu walkabouts, but he always turned up, even if it occasionally took the cops to track him down. The police had found him before, Margie told herself. They would find him again.