Book Week Mystery Logic Puzzle FREEBIE #19 – BOOKSTORE BRAINTEASER! Are you looking for something to challenge your early finishers? Do you want to help your students develop their logical thinking skills? Or perhaps a brain-stimulating activity to keep handy for when you have a few minutes to spare before the bell goes? This Bookstore Brainteaser mystery logic puzzle activity helps develop logical and deductive reasoning skills in a fun way!