Improve your faculties with 70 specially commissioned puzzles, riddles and enigmas concocted by the one detective who needs no introduction, Mr Sherlock Holmes. Dr John Watson, the dear friend and companion of Holmes, has taken the liberty of assembling this collection of trials so you too can test your analytic abilities and hone your deductive sense to avoid making hasty assessments and faulty conclusions.

These rudimentary puzzles have been grouped into approximate levels of difficulty but every question is easy if you know the answer, and the opposite holds equally true.