Charles Dickens died before he was able to complete his final novel, The Mystery of Edwin Drood. So, in this musical adaptation, the audience can decide whodunnit.
The conclusion of the tantalising thriller has become one of literature's greatest puzzles. How did Dickens intend solving the case?
With 439 different possibilities, audiences have their work cut out - as do the cast, who never know what their involvement in the final scenes will end up being.
The audience participate in the outcome by voting as to who murdered Edwin Drood, amongst other things. They vote by applause, as well as a show of hands. Be prepared to hiss and boo in the best Victorian traditions.
It is also a play within a play, in that the mystery is presented as an entertainment show by a troupe of hammy Victorian players known as The Music Hall Royale.
It might sound like a gimmick but there's more to it. The play has won awards for its music and libretto. The score, by Rupert Holmes, has some beautiful and atmospheric tunes, as well as some light-hearted numbers.
The play is produced by Sussex company The Wandering Minstrels.
Simon Edwards directs and the conductor is Gary Nock - the same team responsible for The Baker's Wife and A Little Night Music.
Heading the cast are Bob Hinton, Vicky Mitchell, Kim Godwin, Mike Mackenzie, Richard Godwin, Steve Emery, Sam Brennan, Susan Fleet, Tony Chesterfield, Ed Berridge and Selwyn Morgan.
The award-winning Minstrels, founded 32 years ago, will be out to ensure justice is done.
Starts at 7.45pm, plus 3pm mat Sat. Tickets £9-£12. Call 01273 709709.
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