Arthur Simon Simpson is a small-time crook biding his time in Greece. One of his potential victims turns out to be a gentleman thief planning to steal the emerald-encrusted dagger of the Mehmed II from Istanbul's Topkapi Museum.
Topkapi is a 1964 American Technicolor heist film produced by Filmways Pictures and distributed by United Artists. The film was produced and directed by the émigré American film director Jules Dassin. The film is based on Eric Ambler's novel The Light of Day (1962), adapted as a screenplay by Monja Danischewsky.