The Mirror Crack’d from Side to Side tells the story of Hollywood star Marina Gregg (Lindsay Duncan), who has left the palm trees and bright lights of Los Angeles for the leafy lanes and picturesque countryside of St Mary Mead, England. Having taken up residence at Gossington Hall with her dashing young English husband, film director Jason Rudd (Nigel Harman), his secretary, Ella Blunt (Victoria Smurfit) and Marina’s exclusive personal assistant, Hailey Preston (Brennan Brown), it’s not long before she becomes lady of the manor.

When the glamorous couple decide to throw a benefit for the St John Ambulance, the grounds are abuzz with curious locals including previous owner of Gossington Hall, Dolly Bantry (Joanna Lumley). But when a local fan, Heather Badcock (Caroline Quentin) consumes a poisoned daiquiri, Marina finds herself starring in a real-life mystery - supported by Miss Marple and Inspector Hewitt (Hugh Bonneville), who suspect that the lethal cocktail was intended for someone else. But who? If it was meant for Marina, then why?