The Beatrice Letters is a book by Lemony Snicket. It is tangential to the children's book series A Series of Unfortunate Events, and was published shortly before the thirteenth and final installment. According to its cover, the book is "suspiciously linked to Book the Thirteenth", although the British edition merely states that it "contains a clue to Book the Thirteenth". The book also includes a poster of what appears to be the wreckage of 'The Beatrice', along with a cave, Klaus's glasses, and Violet's hair ribbon.