Wallace in Underland — Charles Ray

Wallace in Underland is a contemporary urban fantasy; Wallace Johnson is a lonely, scared little boy whose life is changed the day he meets a talking rat who helps him escape from the clutches of the neighborhood bullies. Ralph the rat takes him to Underland, a strange place inhabited by talking animals, where a frog in king. The king sends Wallace on a quest, where he learns things about himself that he never knew, and which changes his life forever.