Langtext

Sherlock Bones and Dr. Catson are entangled in an arithmetic adventure. They must follow a teasing trail of addition and subtraction-themed maths puzzles, and it's up to the reader to solve each sum, all in the hope of foiling Professor Moriratty's evil plan.

This charming maths activity book features 'Sherlock's Secret Solver' magnifying glass which reveals the answer to each puzzle when placed over a moiré area, allowing children to test their numeracy skills again and again.

An excellent book which covers part of the number element of the KS2 curriculum in a lively and entertaining way Parents in Touch

Ideal for children aged 7+ (KS2), this fun-filled addition and subtraction-themed maths puzzle book allows children to test their numeracy skills again and again, with a built-in 'reveal the answers' feature that uses a moiré device.

Ideal for children aged 7 to 11 (KS2), this fun-filled addition and subtraction-themed puzzle book allows children to test their numeracy skills again and again, with a built-in 'reveal the answers' feature that uses a moiré device.

Buster BooksBuster Books loves to create books for curious and creative children, which spark the imagination and encourage exploration. Buster Books will satisfy the keenest of puzzle masters, budding artists and the deepest of thinkers. Above all, they are to be enjoyed.

Swanson, KirstinKirstin Swanson is an Assistant Head Teacher at Bourne Abbey Primary Academy. She was an Educational Consultant on the Sherlock Bones series for Buster Books.

Bigwood, JohnJohn Bigwood is an illustrator and graphic designer based in London. He has worked across a range of books for children and adults, such as the best-selling Sherlock Bones series and How to Draw People for the Artistically Anxious.