Ralph S. Mouse
Ralph S. Mouse, now an adult living among his relatives in the attic of the old Mountain View Inn, faces a dilemma when he is overrun by unwanted guests: his own family members have invaded the inn's lobby and are causing chaos. When the hotel owner threatens to fire Matt, the kind custodian who has always looked out for Ralph, Ralph decides it's time to leave — but not before making one last adventure with his trusty motorcycle.
Each book in the series functions as a self-contained adventure with its own primary human characters and setting, so you can enjoy this story without having read the earlier titles.
A television adaptation was produced in 1990 as part of the ABC Weekend Special series, featuring a combination of live-action actors and stop-motion animation for the mice.