Sir Trevor Nunn directs Janie Dee as the reporter who would not accept the official story of three famous American deaths, in Torben Betts's new thriller at the Marylebone Theatre from 30 October. Here is everything you need to know before you book.
A world premiere by Torben Betts, directed by Sir Trevor Nunn and led by Janie Dee, is not a modest proposition for a theatre that only opened in the autumn of 2022. Speculations, subtitled On the Unexplained Deaths of Several American Icons, begins previews at the Marylebone Theatre on Friday 30 October 2026 and plays for nine weeks only. Its subject is a woman history has largely forgotten, and the deaths she refused to stop asking about.
Who is starring in Speculations?
Dee plays Dorothy Kilgallen, the New York columnist and television panellist at the centre of the play. She has two Olivier Awards, for Comic Potential, a part Alan Ayckbourn wrote for her, and for Carousel at the National Theatre, and her stage work also includes Follies at the National.
Five more names were announced in September. Jolyon Coy plays Bobby, Natalie Dunne is Norma Jean, Gloria Obianyo is Flo, Joseph Potter plays Lee and Ferdy Roberts is Carlos. Dunne has worked with Nunn before, as Anna in his world premiere staging of The Third Man at the Menier Chocolate Factory; Obianyo won an Ian Charleson Award for Paradise at the National Theatre; and Roberts is a co-founder of Filter Theatre. Further casting is still to be announced, and our casting report carries the company's full credits.
What is Speculations about?
New York, 1965. Kilgallen is unconvinced by the official versions of three deaths: Marilyn Monroe's in Los Angeles in 1962, President John F. Kennedy's assassination in Dallas the following year, and the shooting of his suspected killer, Lee Harvey Oswald, on live television. Her reporting takes her from Hollywood to the White House and down into the New Orleans underworld, and the links she begins to draw reach Robert Kennedy, Jack Ruby and the crime boss Carlos Marcello. The closer she comes, the more dangerous her questions become. Kilgallen was a real reporter, and her own death in 1965 has attracted speculation of its own ever since.
Betts has made no secret of where he stands. "I've never believed that Lee Harvey Oswald acted alone in the assassination of JFK, and I've always found the circumstances surrounding Marilyn Monroe's death deeply suspicious," he said when the play was announced.
Who is behind the production?
Nunn's record hardly needs restating, but it frames the evening. He became the youngest Artistic Director in the Royal Shakespeare Company's history in 1968, ran the National Theatre from 1997 to 2003, and staged the original productions of Cats and Sunset Boulevard as well as co-directing Les Misérables. Here he works with Lee Newby on set and costume design, Johanna Town on lighting and Gregory Clarke on sound and music. Betts's earlier plays include Invincible, which transferred from the Orange Tree Theatre to the St James Theatre, and the touring thriller Murder in the Dark.
Wild Yak and the Marylebone Theatre present the production, continuing a partnership that brought Tartuffe (Remixed) to the same stage this year. We covered the original announcement in August.
When and where can I see it?
The Marylebone Theatre sits inside Rudolf Steiner House, at 35 Park Road, a short walk from Baker Street. Previews begin on Friday 30 October 2026, press night is on Wednesday 4 November 2026, and the final performance is on Sunday 3 January 2027, so the run crosses the Christmas season. Tickets for Speculations currently start at £46 on our show page.
What else should I book if I like it?
Anyone drawn by a conspiracy and a closing net will find good company elsewhere. The Lives of Others turns the same tension on surveillance in East Germany, and Witness for the Prosecution stages Agatha Christie's courtroom thriller in the council chamber of London County Hall.
For a mystery with the opposite temperament, The Mousetrap at the St Martin's Theatre is still keeping its ending secret after more than seventy years.
