Deadlier Than the Male
Tags: cult, murder

Plot synopsis:
Glamorous assassin Irma Eckman (Elke Sommer), disguised as an air stewardess, kills oil tycoon Henry Keller (Dervis Ward) with a booby-trapped cigar aboard his private jet, parachuting away before the plane explodes. She is picked up by a speedboat driven by her partner in crime, the equally beautiful Penelope (Sylva Koscina). The villainous pair then murder David Wyngarde (John Stone), making it look like a spear fishing accident. Sir John Bledlow (Laurence Naismith), one of the directors of Phoenecian Oil, suspects that both deaths were the result of foul play; he had received an urgent message from Wyngarde that he needed to get in touch with Keller regarding a "matter of life and death". He asks Wyngarde's friend, Hugh "Bulldog" Drummond (Richard Johnson), to investigate.
A representative of an unknown party had approached Phoenecian and offered to overcome Keller's opposition to a merger with Phoenician within six months for one million pounds. Irma shows up at a board meeting to collect. However, the board is divided - with Henry Bridgenorth (Leonard Rossiter) being the most vocal in opposition - and the vote is five to four against paying. That night, Irma and Penelope visit Bridgenorth at his apartment, with fatal results. When the board reconvenes, the directors vote unanimously to pay.
Carloggio (George Pastell), Wyngarde's servant, delivers a tiny bit of a taped message Wyngarde had recorded. Only part of one sentence remains (the assassins stole the rest). Irma and Penelope silence Carloggio, then Penelope delivers a box of deadly cigars to Drummond's flat while he is out. Brenda (Virginia North), a girl Drummond's nephew Robert (Steve Carlson) has brought back to the flat, narrowly escapes the same fate as Keller. Later that night, another attempt is made on Drummond's life.
The next day, Irma makes Phoenecian another proposition: to get them the oil concession in the country of Akmata, despite the King's determination to develop the oil fields himself, for another million pounds. Drummond realises that the King's assassination is what the garbled tape was referring to. Meanwhile, Penelope abducts and tortures Robert, but he can tell her nothing. Drummond follows Irma back to their flat and is able to rescue Robert before he is blown up by a bomb left behind by the two women. He is then astonished to discover that Robert is an old college friend of the Akmatan King Fedra (Zia Mohyeddin).
Irma does away with Weston (Nigel Green), another Phoenecian board member. Drummond travels to the Mediterranean coast. After meeting and warning King Fedra, he is invited to a castle owned by the wealthy Carl Petersen, the genius behind the assassinations. It turns out that Petersen is none other than Weston. Drummond is not allowed to leave the castle. Grace (Suzanna Leigh), one of Petersen's women, confides her desire to leave to Drummond, but Petersen is watching and listening electronically. Irma attempts to seduce Drummond to distract him, but to her fury, he rejects her advances. Penelope is more successful and spends the night in Drummond's bed.
Petersen gives Grace a "second chance"; she uses the opportunity to board the King's yacht as soon as she has the chance, just as Petersen had planned. While playing chess against Petersen with giant motorized pieces, Drummond learns that Grace is unwittingly carrying the bomb intended for the King. He kills Petersen's bodyguard Chang (Milton Reid) and drops Petersen into the hole through which a chess piece is removed from play.
Drummond and Robert race to the King's yacht, capturing Irma and Penelope along the way, and bringing them along. When Irma and Penelope refuse to tell him where the bomb is hidden, Drummond searches Grace for the explosive, finally stripping her naked and throwing her overboard. When the guard holding Irma and Penelope at gunpoint is distracted by this, the pair escape. As they race away in a speedboat, Irma reveals that the bomb is in Grace's hairclip. Penelope is aghast; having envied Grace's chignon, she stole it and is wearing it. The two assassins are killed when it explodes. Meanwhile, Drummond and Robert dive into the sea to rescue Grace.