"I've been a scoundrel, a thief, a blackmailer and a whore,
but never a murderer. Until now..."
The year is 1929. As the
world teeters on the brink of a global recession, Bletchley Park plays
host to a rather special event. MI5 is celebrating its twentieth
anniversary and a select band of former and current employees are
gathering for a weekend of music, dance and heavy drinking. Among them
is Sir Hilary Manningham-Butler, a middle aged woman whose entire adult
life has been spent masquerading as a man. She doesn’t know why she has
been invited – it is many years since she left the secret service – but
it is clear she is not the only one with things to hide. And when one
of the other guests threatens to expose her secret, the consequences
could prove disastrous for everyone.