Gideon's Wrath is the thirteenth in a series of police procedural novels by John Creasey writing as J.J. Marric.

The Dean of St Ludd's approaches Gideon with his suspicions and a plan of action is formulated.

Gideon eventually discovers that they belong to the ‘Simple Brethren’, a secretive group led and financed by lunatic millionaire Hector Marriott, who sees it as his mission to destroy what he considers idolatry.

Whilst Gideon visits Paris to attend an Interpol meeting on gold smuggling, Marriott launches a final lone bombing of St Paul's Cathedral.

Toni Botelli, the main perpetrator, is eventually arrested after a tense stand-off at his premises.