Gortimer Gibbon's Life on Normal Street (2014)

S1E5 Gortimer Gets Shushed

The crew scrambles to get Gortimer’s voice back after it’s snatched by a shadowy stranger behind the wheel of a spectral bookmobile—a vehicle that materializes on Normal Street just once every twelve months. With the clock ticking down to its vanishing act, they chase clues through the neighborhood, determined to outwit the phantom librarian before the day slips away and Gortimer is left silent forever.