DI Lewis and DS Hathaway investigate the murder of Dean Greely and discover he and three others had been in the Sons of the Twice Born club at Oxford. The men have little contact and deny the club's existence. A second member is murdered - it seems they have a secret and someone wants revenge.
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Lewis and Hathaway are assigned to protect Nicky Turnbull, a reformed computer hacker, who's been invited to speak at the Union. But things take a turn when Jo Gilchrist a member of the reception committee is strangled - she was about to expose a professor's exam scam. Then Nicky is shot.
When Rachel Mallory is found dead, it seems she committed suicide but Lewis can't find out why. As he digs into the case he finds she wasn't married to 'husband' Hugh - he swapped wives years before with his business partner. Then a professor promises important information for a favour.