Raymond Smallian's book is probably the most fascinating collection of problems in logic. About three hundred tasks of varying difficulty are grouped into sections, the heroes of which are Knights and Liars, Alice in Wonderland, Bellini and Cellini, and even Count Dracula himself! If a person says: "I'm lying" - is he telling a lie? Why do physicists and mathematicians solve problems differently? How to prove anything? For anyone who wants to learn to reason.