“I gave my dog the signal to proceed. With Tim and I trailing behind her, an all-guns-blazing Molly charged across number 38’s lawn, her stride unbroken as she gobbled up some bacon rind that had been left for the birds. She sprang up to the decking, whirled around to face me, locked her eyes with mine, and—a slither of bacon rind drooping from her mouth—gave me the most emphatic “down” I’d ever seen.

“Oh my god, she’s doing that trembly thing again,” whispered Tim, his voice shaking. “Has she found her?”