The first book in the Dave Gurney series, Think of a Number is a heart-pounding game of cat and mouse that grows relentlessly darker and more frightening as its

When an old colleague comes to him for help solving the mysterious death of his town's most prominent resident, retired NYPD detective Dave Gurney must use all

Join TV Presenter, Johnny Ball for an incredible number-filled adventure, cracking secret codes and unravelling mazes Let your child join Johnny Ball on a dazzl

How many colors are needed to color a map? Must hailstones numbers always fall to the ground? Can statistics prove anything? What is a perfect square, and who h