Life at Walstaff School for Girls has been rather dull for Serena Norton. After having been on her own adventure and helped the great Sherlock Holmes with solving a mystery, how is one supposed to settle down to mundane studies? But mystery is never far away when one really looks. With a new friend by her side and Sherlock Holmes' advice at the ready, Serena must prove that the death of a maid is not the suicide it appears to be.