Thomas, Percy and the Strange Squeaking is a German book, illustrated using photographs from the television series.
The engines are excited when the Fat Controller tells them that Allicia Botti the famous opera singer is coming. But when there is a strange squeaking noise coming from Annie and Clarabel, a mouse appears on the floor. Allicia Botti screams, and refuses to travel on Thomas. That night, during her concert, a home for the mouse is made at Tidmouth Sheds; Thomas and Percy name her Allicia.