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 Daniel Ings as Terence Black Maya Gerber as Stephanie Hackett Ian Peck as Ossie Lloyd Nell Tiger Free as Bunty Glossop Lucy Boynton as Petra Briers Imogen Gurney as Edwina Parrish Simon Kunz as DI Bart Church Struan Rodger as Wilf Karswell Diane Fletcher as Miss Bronwen Symes Susy Kane as Miss Victoria Danby Lynn Farleigh as Tabby Gardiner Tom Prior as Billy Karswell Eve Perry as Antonia Lockwood Emily Warren as Shelly Thengardi Eleanor Northcott as Maud Ashenden Desmond Barrit as Stephen Fitzowen Thomas Arnold as Cendree Wyvern Kate Lamb as Daisy Weiss Michael J. Shannon as Nahum Gardiner Uncredited Colin Dexter as Visitor at Museum