David Lescombe, one of the Whitehall's top civil servants, believes he has a happy marriage to Anna, a successful barrister. But when Anna disappears and, at the same time, Krysalis, a unique NATO file, is removed from David's safe at their home, security services on both sides of the Atlantic are quick to accuse Anna of treason. David determines to find his wife and clear her name. But every step takes him further into danger ... and the evidence against Anna mounts up.
As David uncovers more and more about the woman he married and thought he knew, he also begins to catch glimpses of another tantalizingly vague figure: Gerhard Kleist, the psychoanalyst first consulted by Anna some years previously. Is their relationship merely that of doctor-patient? Are they lovers? Or is Kleist's role something more sinister?