DCI Tom Barnaby is asked by a semi-retired former spy, Brenda Packer, to call in at Allenby House, home of another ex-spy Sir Malcolm Frazer, to see if he can offer any advice on security safeguards at the manor house. For financial reasons, Sir Malcolm has recently agreed to allowing the government to use his home, which he shares with his son Nicky and daughter-in-law Jenny, as a safe house. Their first 'guest' is Jeffrey Larkin an ex-spy who later in life became an arms dealer. Not long after Larkin tells Sit Malcolm that he is aware of the contents of an old East German security file code-named Wolfman, Larkin is found dead, on the cricket pitch. Barnaby is frustrated when Brenda Packard puts a stop to his murder investigation before it even starts forcing him to submit his resignation. It doesn't last long however when a second murder victim is found. The solution lies with events in Berlin, long ago.
—garykmcd