“OK, so I’ve done more research on this hammer,” she said, over Billy’s rustling. “Turns out you can’t actually buy the hammer on its own. It’s only sold as part of a set. Comes with a sixty-piece set in this black tool kit.” She clicked through the images. “Various screwdrivers, lots of different fittings, a file, this little wrenchy thing, measuring tape, a knife, a little saw, pliers or something. You get the picture. So the killer has to have this full set somewhere. Or once had it.”
