Think of a Number is the debut novel of John Verdon published in 2010.

[1][2] It is the beginning of a saga that continues with its 2011 follow-up Shut Your Eyes Tight.

In 2012 a third novel in the David Gurney series was published, entitled Let the Devil Sleep.

In 2014 a fourth novel in the David Gurney series was published, entitled Peter Pan Must Die

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