Deep Water is a 2009 novel in the Cliff Hardy series by Peter Corris.

In April 2009, The Independent Weekly called Deep Water "a web of intrigue".

[1] Deep Water is the thirty fourth novel in the series, whose protagonist has been called "Sydney’s best-known private investigator"[2] In 2009, Corris won the Ned Kelly Award for Deep Water in the fiction category.

[3] The Cliff Hardy series had been thought to end with the previous novel, Open File.

[4] Peter Corris: Cliff Hardy series, www.petercorris.net, archived from the original on 2010-04-16