Fiona Graham, a physiotherapist, is found naked and lying face down in the swimming pool of Croxley Hall health farm where she worked. The coroner's verdict: accidental death by drowning. However, both her father and Golding, the forensic pathologist, disagree with his ruling. Inspector Roger Newton arrives with his assistant, Jane Warwick, to investigate a murder. But when Jane disappears, it's a race to unravel the 'Cryptic Clue' to her whereabouts - and the reason for Fiona's death.
Used availability for Peter Conway's Cryptic Clue
1984 : UK Hardback
April 2007 : UK Paperback