Bennie the Beltmouse Meets the Phantom of the Tunnel
Book four is the end of the Adventures of Bennie the BeltMouse, but not the end of Bennie. The Plant Lady is sorry to see this story end, but is assured by the creatures of the grass that Bennie's story will continue in the Further Adventures of Bennie the BeltMouse. Watch for it to come.
In this story, Bennie completes his quest, and finds it lonely in his little home after his adventures.