Basil is the famous sleuth of mousedom! He lives in the cellar of Sherlock Holmes’s house. He is a devoted admirer of the great detective Sherlock Holmes. He has learned his craft by listening at the feet of Holmes himself. But will it be enough to help Basil solve his most baffling mystery yet?

The Mystery of the Missing Twins is one of the strangest cases in Basil’s career. He only has a few crumbs of clues with which to find answers. Will he figure out where Angela and Agatha are being kept? Are Basil’s mouse sleuthing skills be up to the task of finding the twins before it’s too late?