Tom Stoppard 
Hapgood [EPUB ebook] 

I can't remember which side I'm supposed to be working for, and it is not in fact necessary for me to know. The Cold War is approaching its endgame and somebody in spymaster Elizabeth Hapgood's network is leaking secrets. Is her star double agent really a triple? The trap she sets becomes a hall of mirrors in which betrayal is personal and treachery a trick of the light. Tom Stoppard's Hapgood premiered at the Aldwych Theatre, London, in March 1988. It was revived at the Hampstead Theatre, London, in December 2015.