Think of a Number

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 pace accelerates   Threatening letters arrive in the mail over a period of weeks, ending with a simple declaration: “Think of any number . . . picture it . . . now see how well I know your secrets.” Those who comply find that the letter writer has predicted their random choice exactly. But when oddities that begin as a diverting puz