In this compelling investigation, Michael Smith explores the critical moment in a spy's life: that split-second decision to embrace a double life; to cheat and hide and hurt; to risk disgrace - even death - without any guarantee of being rewarded or even recognised.
Through in-depth insider knowledge, Michael Smith also uncovers new and unknown cases, including ISIS, President Trump's links with Russia and Edward Snowden's role as a whistleblower to offer compelling psychological portrait of these men and women, homing unerringly on the fault-lines and shady corners of their characters, their weaknesses and their strengths, the lies they tell other people, and the lies they always end up telling themselves.