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Gerald Hadleigh, secretary of a writers’ circle, is found battered to death the morning after the group’s meeting with best-selling novelist (and former psycho-therapist) Max Jennings. Gerald did not want to invite Max to Midsomer Worthy, and he seemed apprehensive about the visit. Barnaby’s investigations show that Gerald was a man of mystery—he had no National Insurance number, no family, and no marriage certificate to go with his wife's photograph. And it seems he had a mysterious woman visitor on the night of his death... then Max Jennings goes missing and is found dead.
- John Nettles as DCI Tom Barnaby
- Daniel Casey as Sgt. Gavin Troy
- Jane Wymark as Joyce Barnaby
- Laura Howard as Cully Barnaby
- Barry Jackson as Dr. George Bullard
- Anna Massey as Honoria Lyddiard
- Joanna David as Amy Lyddiard
- David Troughton as Brian Clapper
- John Shrapnel as Max Jennings
- Jane Booker as Laura Hutton
- Judith Scott as Sue Clapper
- Robert Swann as Gerald Hadleigh
- Una Stubbs as Selina Jennings
- Annoushka Le Gallois as Barbara Neale
- Marlene Sidaway as Mrs. Bundy
- Nancy Lodder as Edie Carter
- Daniel Newman as Tom Carter
- Marcus Rogers as Denzel
- Zoot Lynam as Collar
- Mark Bagnall as Boreham
- John Bardon as Mr. Belgrove
- Jacqueline Morgan as Miss Panter
- Timothy Bateson as James Jocelyne
- Jay Barrymore as Liam
- Murray Ewan as Liam's Father
- Neil Conrich as Police Constable Angel
- Paul Putner as Policeman 2
- David Maybrick as Policeman 3
- Brian Parr as Mr. Baker
- Bryan Burdon as Barman
- Richard Parkin as Brad (Cully's Boyfriend) (uncredited)
Prior to the Episode
In the Episode
- This episode and The Dagger Club share some similarities:
- In both episodes, the action is centred around books and the solution to the investigation lies in a book. Also, the person who reads the book is not the DCI Barnaby of the time, but the Mrs Barnaby of the episode.
- In both episodes, Una Stubbs is a guest actor.
- The musical themes for the episodes ("Discovery of a dead body" for Written in Blood and "Roulette" for The Dagger Club) are very similar.
- It is revealed that Tom is allergic to cat fur.
- This is the first time the Causton Comprehensive School is mentioned and also the first time it is shown.
- Following the previous episode, this is the second time when the murderer/murderers die before they can be arrested by Barnaby and Troy.
- This is the first appearance of Timothy Bateson's character Mr. Jocelyne. He also appeared in the episodes Death's Shadow and Orchis Fatalis and was mentioned in several other episodes.
- Although, Marlene Sidaway had a small role as a counsellor in the previous episode, Written in Blood marked the debut of Mrs. Bundy. The character later appeared in Death's Shadow
The following actors and actresses that first appeared in this episode have appeared in subsequent episodes
- Marlene Sidaway - The Killings at Badger's Drift, Death's Shadow and Judgement Day
- Paul Putner - The Killings at Badger's Drift
- Anna Massey - Secrets and Spies
- Joanna David - A Sacred Trust
- David Troughton - The Animal Within
- John Shrapnel - Death in Chorus
- Jane Booker - The Creeper
- Una Stubbs - The Dagger Club
- Timothy Bateson - Death's Shadow and Orchis Fatalis
- David Maybrick - Death of a Stranger
- Brian Parr - Picture of Innocence and Talking to the Dead
- the Script mentions the poison as Valium Sulphate, however it is more likely Thallium Sulphate