The Case of the Scorpion's Tail (1971)

When a plane explodes in the air with no survivors, the unfaithful Lisa Baumer is informed that her husband, businessman Baumer, left a one-million-dollar insurance policy and she is the beneficiary. She travels from London to Athens to receive the payment in cash and then to travel to Greece to meet her lover. Meanwhile, the insurance company suspects that a bomb might be planted in the plane and assigns their investigator Peter Lynch to investigate the widow in Greece. Soon she is threatened by Baumer's lover Lara Florakis and her bodyguard Sharif, but Peter protects and rescues her from the attackers. When the front desk calls Lisa to take the taxi to the airport, they discover that she was murdered, and the money has vanished. Soon local Police Inspector Stavros, Interpol Agent John Stanley and the French Investigative Reporter Cléo Dupont, who is having an affair with Peter, investigate the case where Peter is the prime suspect.