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 Vinette Robinson as Sgt. Sally Donovan Yasmine Akram as Janine Danlevy Lara Pulver as Irene Adler Ed Birch as Tom Adam Greaves-Neal as Page Boy / Billy Ritu Arya as Gail Alfred Enoch as Bainbridge Alistair Petrie as James Sholto Tim Chipping as Duty Sergeant Will Keen as Major Reed Alice Lowe as Tessa Nicholas Asbury as Landlord Oliver Lansley as David Jalaal Hartley as Photographer Debbie Chazen as Vicky Wendy Wason as Robyn Helen Bradbury as Mum Georgina Rich as Charlotte
