William 'Bill' Anderson, known locally as Commander, is living in Marbella where he has an apartment and a sailboat named High Tide.
Unbeknownst to Commander, Deborah was romantically involved with Patrick, but she had broken off the relationship earlier that night aboard the Five Angels.
Angered by her decision, Patrick exacts revenge by violently ramming his yacht into Commander's sailboat when he spots Deborah onboard.
Although she is badly shaken by the night's ordeals, Commander takes Deborah safely ashore, but she flees the scene on foot, leaving him perplexed by her erratic behaviour.
Commander then briefly visits Geneva to open a Swiss bank account that will hold the funds he intends to fleece from Patrick.
Commander asks a local Marbella photographer, Gustavo, to begin gathering intelligence by filming Patrick's activities.
Commander explains that Patrick funnels the profits in his Marbella safe deposit box into a numbered and anonymous Swiss account with no name.
When Commander learns from Herman and John that Mario has failed to return from his surveillance of the mansion, they conduct a daring night-time raid to rescue him.
Faced with the prospect of having to abandon the entire scheme, Commander hastily engineers a plan to enlist the help of a former military acquaintance, Sergeant Major McBride, who resides in Gibraltar, off the coat of Spain.
He demands that she return to Marbella aboard the High Tide's inflatable dinghy, but Mirian refuses, stating that she would like to see Gibraltar.
When he catches up with her, Mirian's tank top is accidentally ripped off, revealing her breasts, and the pair kiss romantically.
She asks for a lift due to a car problem, and as they drive into town together, Deborah grabs the glasses from the concierge's face, making his vision blurry and causing him to lose control of his vehicle.
When the car jolts to an abrupt stop, Deborah cracks the lenses on the glasses, to make it harder for the concierge to detect that Mario is in fact not Patrick but an impersonator at the bank.
Meanwhile, Mirian sits in a parked car, intending to create an accident when Patrick drives past, to delay his arrival at the bank.
Inspector Vargas, a confederate in the group's plans unbeknownst to them, further delays Patrick's departure from the accident by asking what occurred.
The group's tactics work, giving them enough time to get into Patrick's safe deposit box before he arrives at the bank after the delay.
Later that night, he returns to his sailboat, the High Tide, in a drunken and frustrated state, where he finds that Deborah has been waiting for him.
The next morning Herman, John and Mario arrive at the High Tide's mooring to begin the journey to Switzerland.
Having fled Marbella to escape any revenge or retribution by Patrick after fleecing him of his money, Commander and Deborah move into a large estate hidden by heavy foliage.
After some harsh words, Deborah packs her belongings into a taxi and departs, causing Commander to contemplate a life spent alone in his secluded refuge.
Co-starring with Rod Taylor (Commander) and Britt Ekland (Deborah) were José Guardiola (who plays the gangster villain Patrick Arnel) and Emma Suárez, with whom Taylor's character, Commander, has a brief romantic fling before losing her to his younger sidekick Mario, played by Óscar Ladoire.
Other actors who appeared in the film include Sancho Gracia, Francisco Rabal and Fernando Fernán Gómez.
Spanish actor Sancho Gracia, who plays the role of Inspector Vargas, was involved in an affair with Racquel Welch in Spain in 1968 during the filming of the movie 100 Rifles.
When Curtis learned of the romantic fling, he chased Gracia at gunpoint through the Aguadulce hotel where the cast and crew of 100 Rifles were staying.
[2][3] Paul Chiten, a Los Angeles-based songwriter who has worked with many major musical stars including Cyndi Lauper and Donna Summer, penned the Marbella soundtrack, including the film's radio-friendly endispiece, 'Poet For the Moonlight', sung by vocalist Devere Duckett.