Trikymia mias kardias (1969)

Alekos Anastasiadis, a brilliant atomic scientist at the Demokritos Institute of Nuclear Technology, has unknowingly caught the eye of a mysterious spy tracking his every move. Under everyone's nose, the stealthy secret agent is bent on stealing the professor's groundbreaking research and will stop at nothing to get it. In this high-stakes game of deceit and international espionage, everyone is a suspect, and the enemy is everywhere. Could Lena, the alluring blonde stranger, also be part of a sinister grand scheme?