Liverpool Sound and Vision Rating * * * *

Cast: Jason Watkins, Tala Gouveia, Jack Riddiford, Claire Skinner, Lily Sacofsky, Danyal Ismail, Sian Phillips, Alan Davies, Catherine Tyldesley, Holly Aird, Gabriel Bisset Smith, Charlie Chambers.

The locked room mysteries have not quite had their day, but they certainly have exhausted the imagination of many a writer; so much so that it will take a phenomenal tale worthy of being presented by a supreme great to revive significant interest in the genre once again.