Think of a Number

It begins with a letter. The letter contains a request - think of a number - and a sealed envelope. Inside the envelope is that number. When Dave Gurney, retired NYPD homicide detective, is contacted by an old college acquaintance about startling letters he's been receiving. How else was he able to predict his victim's thoughts, even his actions?

Incepe cu o scrisoare. Scrisoarea contine o cerere - ganditi-va la un numar - si un plic sigilat.