RB100 The Fur Thieves

Moose McBain's traps are being robbed. Moose lives deep in the forest with his two sons. Trapping is Moose's only way to make a living. While Moose sets one line of traps, someone robs another of his trap lines. He can't catch these thieves or stop them. The thieves even manage to erase their tracks completely. Moose asks Bill and the boys to find and stop the thieves. Who are these thieves? Why are they robbing Moose? Can our rangers find and stop whoever is doing this?