Its Marty Mooses first day on the job as Postmouse. Hes ironed his uniform, polished his buttons and waxed his whiskers; hes ready to go! But things take a tricky turn when he gets lost in Whisker Warren and needs rescuing by a doolally rabbit named Nibbles, and then gets caught in the crossfire of two less-than-neighbourly toads. Who knew postage could be so perilous!