Guest Stars Rupert Graves as DI Lestrade Una Stubbs as Mrs. Hudson Louise Brealey as Molly Hooper Mark Gatiss as Mycroft Holmes Amanda Abbington as Mary Morstan Sian Brooke as Eurus Holmes Simon Kunz as Sir Edwin Lindsay Duncan as Lady Alicia Smallwood Tanya Moodie as Ella Paul Chequer as DI Dimmock Charles Edwards as David Welsborough Eleanor Matsuura as DI Hopkins Sacha Dhawan as Ajay Amanda Root as Emma Welsborough Gabrielle Glaister as Ambassador Rob Callender as Charles Welsborough David Colbourn as Male Client Neal Barry as Ray Kingsley Daniel Hoffmann-Gill as Gold Teeth Man Harry Gostelow as Husband Marcia Warren as Vivian Norbury Hattie Ladbury as Female Client Richard Syms as Vicar Edward Judge as Craig James Holmes as Plane Passenger Andrew Bone as Jack Sandeford Aleksandar Mikic as Guard Eiry Thomas as Stewardess Albert Magashi as Karim
