The book "The Little Cryptogram. A Literal Application of Mr. Ignatius Donnelly's Cipher System to the Play Hamlet by Joseph Gilpin Pyle" is a study that attempted to apply Ignatius Donnelly's cipher method to the study and deciphering of the symbolism and mysteries of William Shakespeare's Hamlet. The author of the book reveals an attempt to reveal possible additional content layers in the well-known play using cryptographic methods. This is a fascinating study at the intersection of literary studies and cryptography, which allows the reader to delve into the complex symbolic interpretations of one of the most famous works of world literature.