Think of a Number

Think of a Number is the debut novel by John Verdon, published in 2010, which marks the beginning of the world-famous "Dave Gurney" detective series. The plot follows retired NYC homicide detective Dave Gurney as he investigates an unnerving killer who sends mysterious letters to victims, accurately predicting the exact numbers they think of and knowing their deepest secrets. Renowned for its high tension, clever mind games, and surprising plot twists, the book has become a classic in the mystery and psychological thriller genres.