Private detective John Duval, an ex-lieutenant commander in the Royal Navy and Naval Intelligence, finds himself the prime suspect in a police hunt for a sexual killer when three women are brutally murdered.
| Actor | Role |
|---|---|
 James Weber BrownJohn Duval | John Duval |
 Indira VarmaDr. Catherine Benson | Dr. Catherine Benson |
 Dervla KirwanDI Jane Ambrose | DI Jane Ambrose |
 Annie CooperTobi Wright | Tobi Wright |
 Hugh BonnevilleCommander William Calthorpe | Commander William Calthorpe |
 Tom BeardMr. Bowles | Mr. Bowles |
 Susie AmyRosemary Calthorpe | Rosemary Calthorpe |
 Alistair PetrieLieutenant Charles 'Chuck' Carter | Lieutenant Charles 'Chuck' Carter |
 Elizabeth HealeyRachel Garvie | Rachel Garvie |
 Vicki MichelleMary Woodward | Mary Woodward |
 Angela ThorneMrs. Garvie | Mrs. Garvie |
 Cat SimmonsDC June Francis | DC June Francis |
 Andrew WhippDS Pinker | DS Pinker |
 Danny WebbDavid Frampton | David Frampton |