Dear Wallander: Advice for a Concerned Mother

This week's guest columnist is Kurt Wallander, the brooding Swedish police inspector who looks like he hasn't shaved, or slept, for days.    Dear Wallander, I'm the mother of three beautiful young boys—ages 3, 6, and 8—and one of them is lying to me. I found Gilly the Goldfish on the rug, ten feet from…