Guest Stars Caroline O'Neill as Win Thursday Abigail Thaw as Dorothea Frazil Sara Vickers as Joan Thursday Jack Bannon as Sam Thursday Shvorne Marks as Monica Hicks Anya Taylor-Joy as Philippa Collins-Davidson Maya Gerber as Stephanie Hackett Ian Peck as Ossie Lloyd Daniel Ings as Terence Black Nell Tiger Free as Bunty Glossop Lucy Boynton as Petra Briers Simon Kunz as DI Bart Church Imogen Gurney as Edwina Parrish Struan Rodger as Wilf Karswell Susy Kane as Miss Victoria Danby Kate Lamb as Daisy Weiss Tom Prior as Billy Karswell Eve Perry as Antonia Lockwood Emily Warren as Shelly Thengardi Eleanor Northcott as Maud Ashenden Diane Fletcher as Miss Bronwen Symes Desmond Barrit as Stephen Fitzowen Thomas Arnold as Cendree Wyvern Lynn Farleigh as Tabby Gardiner Michael J. Shannon as Nahum Gardiner Uncredited Colin Dexter as Visitor at Museum