Guest Stars Una Stubbs as Mrs. Hudson Rupert Graves as DI Lestrade Louise Brealey as Molly Hooper Mark Gatiss as Mycroft Holmes Amanda Abbington as Mary Morstan Sian Brooke as Eurus Holmes Lindsay Duncan as Lady Alicia Smallwood Tom Brooke as Bill Wiggins Gina Bramhill as Faith Toby Jones as Culverton Smith Georgina Rylance as Carmelia Katy Wix as Nurse Cornish Eric Koflabrefa as Policeman Lee Knight as Reporter Martin Savage as Ivan Matthew Romain as Nervous Andrew Usman Akram as MI5 Agent David Kirkbridge as Policeman Sharon Ballard as Policewoman Asheq Akhtar as Sahaad Vijay Doshi as Gavin Ben Abell as Indignant Man Miranda Hennessy as Reporter Dominic Borelli as Husband Eileen Dunwoodie as Wife
