Every Series 4 episode in broadcast order, followed by a spoiler-controlled story overview, production-area index and coverage summary.
A crime novelist’s death appears to echo a final book. Humphrey asks whether fiction predicted events, inspired them or was arranged to conceal the truth.
8 guest credits · writer and director recorded
Open Episode 1 details →A run of break-ins produces a crime scene that has been unusually cleaned. The team investigates what was removed, what was left and why.
7 guest credits · writer and director recorded
Open Episode 2 details →An allergic reaction at a Morris-dancing event becomes suspicious when an emergency injector proves empty. The team reconstructs who handled it.
8 guest credits · writer and director recorded
Open Episode 3 details →Damage at a seaweed farm and an account involving a mermaid pull the investigation towards the water.
7 guest credits · writer and director recorded
Open Episode 4 details →A fire in an off-grid community is accompanied by stories of the Green Man. The team examines practical systems and relationships.
10 guest credits · writer and director recorded
Open Episode 5 details →A fire at a pirate-festival exhibition and a treasure map create a finale full of theatrical clues. The team separates performance from evidence.
8 guest credits · writer and director recorded
Open Episode 6 details →The regular cast — Kris Marshall (DI Humphrey Goodman), Sally Bretton (Martha Lloyd), Zahra Ahmadi (DS Esther Williams), Dylan Llewellyn (PC Kelby Hartford), Felicity Montagu (Margo Martins), Barbara Flynn (Anne Lloyd) — appears throughout. These are the guest stars, episode by episode.
| Episode | Guest cast |
|---|---|
| Episode 1 27 March 2026 | Alex Macqueen (Anthony Westley), Andrea Lowe (Helen Linder), Michael Cochrane (Kenneth Linder), Nimmy March (Bethan Hughes), Omar Ibrahim (Eddie), Sandra Hale (Jill), Vincent Franklin (James Smith), Wayne Cater (Dafydd Bevan) |
| Episode 2 3 April 2026 | Colin McFarlane (Roger Franklin), Emily Stott (Amy), Gina Bramhill (Amelia), Noah Thomas (Adam Walsh), Raquel Cassidy (June Harris), Teddy Jay (Sam), Tristan Sturrock (Clive Harris) |
| Episode 3 10 April 2026 | Alec Nicholls (Bob Turner), Elliot Janks (Craig), Eva Feiler (Nurse Lucy Thompson), Gina Bramhill (Amelia), Phil Daniels (Marvellous Harris), Rebecca Night (Holly), Tom McCall (Matthew), Vincent Franklin (James Smith) |
| Episode 4 17 April 2026 | Gina Bramhill (Amelia), Henry Miller (Jeff Simmons), Rina Mahoney (Diana Cooper), Susan George (Dr Mary Rhodes), Susan Penhaligon (Maud Dingleby), Talia Robens (Lacy Dingleby), Xander Pang (Elijah Moore) |
| Episode 5 24 April 2026 | Avita Jay (Alex), Ben Allen (Paul Outram), Elaine Claxton (Mavis), Hazel Caulfield (Agnieszka), Ian Hughes (Evan Cole), James Clay (Lee Outram), Kenneth Collard (Edmund), Nathan Dean Williams (Woody), Vincent Franklin (James Smith), Yasmin Wilde (Janice) |
| Episode 6 1 May 2026 | Cassandra Wilson (DI Janet Wilson), Graham Dickson (Tyler Brigden), Hazel Caulfield (Agnieszka), Melanie Walters (Geraldine Desai), Narinder Samra (Sanjeev Desai), Narinder Samra (Dev Desai), Phil Daniels (Marvellous Harris), Vincent Franklin (James Smith) |
Married life, housing problems and pressure on the police station create a sustained series arc. Humphrey must face a decision about the team while new and returning community characters move between the case and personal stories.
The fourth series returns to Looe and South East Cornwall for cases involving literature, Dark Morris, maritime folklore, off-grid living and a pirate festival.
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