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