A fresh cryptogram sparks alarm for Detective Superintendent Sue Manson.

Has the murderer changed their system?

Starring Susan Lynch and Philip Glenister.

Bill Murphy's detective thriller about the hunt for a serial killer obsessed with mathematics.

DS Sue Manson .... Susan Lynch
James Ellstrom .... Philip Glenister
Fred Johnston .... Clive Merrison
Inspector Phillips .... David Bannerman
PC Mags Langan .... Alison Pettitt
Lee Horsley .... David Holt
Superintendent Midgeley .... Nigel Anthony

Director Tanya Nash

First broadcast on BBC Radio 4 in August 2002. Show less