Anthony Horowitz Creator, Writer Andrew Scott James Devereaux Actor Ken Bones Max Hoffman Actor Stephen Boxer Professor Fraser Actor Kate Duchene Helen Fraser Actor Patrick Joseph Byrnes American Scientist Actor Dylan Charles Aleksei Gorin Actor Tim McMullan Arthur Valentine Actor Joe Duttine Frank Shaw Actor Ellie Haddington Hilda Pierce Actor Nicholas Jones Sir William Chambers Actor Honeysuckle Weeks Sam Wainwright Actor Daniel Weyman Adam Wainwright Actor Jennifer Hennessy Ruth Shaw Actor Sam Clemmett Jack Shaw Actor Gyuri Sarossy Tomasz Debski Actor Steve Wilson Duty Police Officer Actor Christopher Fulford Det. Supt. Cranborne Actor Anne Kent Woman on Stairs Actor Stephen Swift Radiation Soldier Actor Bush Moukarzel Soldier at Vlessing's Actor Jeremy Swift Glenvil Harris Actor Philip Judge Cyril Conway Actor Gabrielle Lloyd Maureen Greenwood Actor Georg Nikoloff Russian Agent Actor Michael Kitchen Christopher Foyle Actor Alan Cumming Self - Host Actor Jill Green Executive Producer Jim Reeve Executive Producer Stuart Orme Director