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The dead body is one of Juan's minions. Juan's gang had been tracking Duke's hideout, and this minion was sent to spy on them. He was killed before the couple arrived, likely as part of the gang rivalry over the stolen valuables.

Earlier dialogue hints that Juan's gang has been tailing Duke's movements.

Duke develops an attraction to Sally during the hostage situation. His interest is partly physical but also stems from the power dynamic, he's drawn to someone outside his criminal world. This complicates the situation and creates tension with his girlfriend Rina.

Duke's interest is first noticeable when he interacts with Sally during the standoff.

Rina sabotages the plane out of jealousy and revenge. She watches Duke show obvious interest in Sally, which angers her. When Duke and his gang board the plane to escape with the valuables, Rina shoots the pilot and then fires at the fuel tank, causing the plane to burst into flames and kill everyone on board.

Rina's jealousy is established earlier when she becomes antagonized by Duke's obvious interest in Sally.

Juan discovers the hideout through his own minion who was sent to spy on Duke's gang. That same minion is found dead in the cottage when Gary and Sally arrive, confirming Juan had traced the location and sent someone to investigate or confront Duke's men.

The timeline establishes Juan as a rival gangster actively seeking the stolen valuables.

A bloody shoot-out erupts between Duke's gang and Juan's men. Duke's gang gets the better of the exchange, defeating the rival gang. Geoff and Sally remain caught in the middle, enduring rough treatment from both sides as they endure the crossfire.

The stand-off between the two factions escalates throughout the film until violence becomes inevitable.

Duke and his gang plan to smuggle the stolen valuables out of the country. An airplane provides the fastest escape route and makes them harder to trace compared to road transport. The plane is waiting at a nearby airfield for their departure.

The gang's original plan involves smuggling the valuables out of the country, not simply driving away.

Yes, Geoff and Sally survive. While the gangsters all die in the plane fire caused by Rina's sabotage, the couple is left alive in the aftermath. However, they have merely survived a traumatic ordeal, the ending is bleak, offering no real victory or safety for them.

The couple remains under guard throughout the film but is never marked for execution.

Rina is Duke's girlfriend and expects his loyalty. When Duke starts showing obvious interest in Sally, his attraction visible to everyone, Rina becomes antagonized. This jealousy intensifies the conflict within Duke's gang and ultimately drives her to exact revenge by destroying the plane.

Rina's jealousy is first noted when Duke's interest in Sally becomes apparent during the stand-off.

Four people die in the plane fire: Duke and his gang members who boarded the plane. Rina commits the act by shooting the pilot first, then hitting the fuel tank, causing the aircraft to burst into flames. Geoff and Sally are not on the plane.

The tense take-off scene shows the gang boarding, while Rina watches from outside with murder in her eyes.

Both Duke's gang and Juan's gang want the stolen jewels they have been smuggling. Duke's gang has hidden the valuables in the empty cottage, planning to transport them out of the country. Juan's gang discovered the location and wants to claim the goods for themselves, leading to the violent confrontation.

The initial confrontation reveals the bungalow is being used as a hide-out for stolen valuables.

Geoff and Sally are held at gunpoint by armed gangsters from the moment Duke's men confront them. They are restrained and closely guarded throughout the stand-off, preventing any opportunity to escape or call for help. The isolated location of the countryside bungalow also makes rescue unlikely even if they could signal.

The couple is described as being held captive and roughly treated by both sides.