An illustrated adaptation of Sir Arthur Conan Doyle's classic Sherlock Holmes mystery - at an easy-to-read level for readers of all ages! Also includes a QR code for the free audiobook!

Be at the third pillar from the left outside the Lyceum Theatre tonight at seven o'clock. You are a wronged woman and shall have justice. Do not bring police. If you do, all will be in vain.

When Holmes is asked to look into a cryptic message received by Mary Morstan, neither he nor Watson expect to be drawn into a decades-old web of betrayal. Soon they're conducting dangerous moonlit expeditions to uncover the meaning of the sign of the four, and resolve a long-buried crime.