Hollywood descends on Cambridge when the historic Round Church becomes a film set for Viking Bride, starring famous – albeit fading – actress Agnes Dermont.

But Agnes’ big comeback quickly descends into farce due to the woeful script and acting, not to mention the general disregard for historical authenticity – although a Viking knife turns out to be a little too real when Agnes is found with it buried in her chest.

Detective Chief Inspector Arthur St. Just encounters bitter rivalries, simmering tensions and devastatingly dark secrets among the cast and crew as he investigates, but can he work out who was so determined that Agnes wouldn’t make the film’s final cut?