Which Marble Hall Murders Character Are You?

Learn More About Marble Hall Murders

Marble Hall Murders is the third and final chapter in Anthony Horowitz's Susan Ryeland trilogy, following Magpie Murders and Moonflower Murders as a MASTERPIECE Mystery! event on PBS. Lesley Manville returns as Susan Ryeland and Tim McMullan as the fictional Golden Age detective Atticus Pünd, with the six-episode series premiering September 6, 2026, airing weekly through October 11.

The show's signature trick is its double structure: Susan, a real-world book editor, is hired to help finish a continuation novel in the Atticus Pünd series after its author dies under suspicious circumstances. As she digs into the manuscript, she's pulled into an actual murder investigation — and finds herself a suspect. Meanwhile, inside the novel itself, Pünd travels to the Isle of Corfu to investigate the death of the imperious Lady Margaret Chalfont, whose family closes ranks the moment he starts asking questions.

That dual-layer conceit is part of what has made the Ryeland series such a hit with mystery fans: nearly every character exists twice, once in Susan's real world and once inside the pages of the novel she's editing. Several cast members play both versions, including Zubin Varla as Frederick Turner and his fictional counterpart Achilles Vassilikos, and Patricia Hodge as both matriarch Miriam Crace and Lady Margaret Chalfont. It's a clever bit of doubling that rewards close attention — the fictional murder often mirrors the real one in ways that only become clear by the finale.

At the center of the real-world mystery is Eliot Crace, the ambitious but insecure young writer tasked with continuing the Pünd series and living in the shadow of his famous grandmother's literary empire. His discomfort with his own family's legacy — and the secrets buried underneath it — sets the entire plot in motion long before anyone realizes a real crime has been committed.

Manville brings the same dry wit and dogged curiosity to Susan that made her a fan favorite in the earlier installments, while McMullan's Pünd remains the show's quiet center of gravity: understated, precise, and always several steps ahead of everyone around him. The supporting cast, including Mark Bonnar, Harry Lloyd, Rupert Penry-Jones, Danny Sapani, and Jamie Blackley, rounds out a story that spans decades, continents, and two entirely different mysteries at once.

For longtime MASTERPIECE viewers, Marble Hall Murders closes out a trilogy that has consistently earned praise for its intricate plotting and old-school mystery charm — the kind of show where every character has a motive and every motive has a story behind it. Horowitz himself has called this installment potentially the strongest of the three, promising even more twists than its predecessors.

Whether your instincts run toward Susan's relentless curiosity, Pünd's composed brilliance, or the more tangled, secretive personalities circling the Chalfont and Crace families, this quiz will help you figure out exactly where you'd land inside Marble Hall Murders' twisting double mystery.