The book is an open correspondence about faith and unbelief between the world famous postmodern writer Umberto Eco and one of the hierarchs of the Catholic Church, Cardinal Carlo Maria Martini. This small book has already been translated into many languages ​ ​ of the world and in many countries it has become a bestseller. The Russian edition includes a preface to the American edition, written by Harvey Cox, one of the most interesting modern Western theologians.