[sufue]

Above Suspicion by Helen MacInnes has dropped to $2.99 at Kindle US.

link: http://www.amazon.com/Above-Suspicio...dp/B008QNE716/

Spoiler:

Richard and Frances Myles are preparing for their annual European summer vacation in 1939 when they are visited at their Oxford college by old friend Peter Galt, who has a seemingly simple job for them. But in the heightened atmosphere of pre-war Europe, nobody is above suspicion, in fact the husband and wife are being carefully monitored by shadowy figures.

Above Suspicion was MacInnes’ breakthrough book, a bestseller published in 1941 and released as a movie in 1943, directed by Richard Thorpe and starring Joan Crawford and Fred MacMurray.

“Hide and seek with death - in the shadow of terror... The hallmarks of a MacInnes novel of suspense are as individual and as clearly stamped as a Hitchcock thriller.” - The New York Times

It's also 99p at Kindle UK (link here) and as part of the Sainsbury sale decribed in Lynx-lynx's post above.