The Snowy Day Mystery (Cam Jansen, Bk. 24)

It’s a very snowy day outside, so Cam and Eric are running late to computer lab. When they finally arrive, they realize that three computers are missing! There are only two clues - footprints in the snow outside and a locked window. This mystery seems impossible to solve, but with Cam Jansen on the case, the thieves don’t stand a chance!