In fact, this book is a decryption of "secret heresy codes" in the work of Jerome Bosch. Having studied a huge amount of material and analyzed a lot of fragments of paintings, including those that were not preserved, the author shows how much contemporaries and eminent customers of the great artist were mistaken, believing that they were dealing with a respectable Christian illustrating Christian ideas. L. Harris opens us up to new facets of Bosch's work, proving that all his works consistently convey heretical doctrines. The book contains a large number of illustrations, both black and white, and color, which will give the reader a real aesthetic pleasure, and invites you to once again admire the work of this great master.