The Boulder’s Warning
Death on the NileA falling boulder changes an apparent threat into a murder attempt, heightening suspicion even though it cannot immediately identify the culprit.
increasing
Bearing strength in each event
decreasing
A Dangerous Landscape

Rocks Above the River
The setting
The Karnak travels through a narrow, rugged landscape, and Linnet admits to Poirot that she feels trapped among enemies. The terrain makes the voyage feel increasingly unsafe.
A warning without a source
Her fear is not proof of a plot, but it establishes a mood in which an accident could conceal deliberate harm. Poirot has already learned that danger surrounds the marriage.
A Close Escape

The Boulder Falls
A sudden attack
Linnet and Simon rest near the cliff when a large boulder hurtles past them. Simon pulls Linnet away just in time, and the stone would have crushed her had she stayed in place.
A deliberate suspicion
The party can see a path above, but no attacker remains in view. The near-disaster may be accidental, yet its timing makes the possibility of attempted murder impossible to ignore.
The Wrong Suspect

Jacqueline’s Absence
Relief and doubt
Simon initially curses Jacqueline, assuming she caused the attack. When she arrives from the opposite direction, his anger gives way to relief.
A clue to another hand
Poirot recognizes that Jacqueline could not have been responsible for this particular incident. The failed attack therefore widens the field of possible enemies rather than resolving the danger.
The Earlier Plot Reconsidered

Accident or Attempt
Pennington’s lie
Andrew Pennington claims he was inside the temple when the boulder fell, but Poirot knows he was not there. The false account connects the financier to the near-attack.
A motive emerges
Pennington admits that he tried to obtain Linnet’s signature and was in financial trouble. He confesses to the boulder incident as an accident, but his admission confirms that he had reason to want her removed.
A Warning Outlived

The Boulder’s Place in the Case
A separate danger
The boulder attack is linked to Pennington’s desperate circumstances, not to the conspirators’ successful murder plan. The case contains more than one person willing to endanger Linnet.
Suspicion made credible
The incident explains why Linnet sensed enemies before she could name them. It also warns Poirot that a plausible accident can hide intent without proving who committed a later crime.
During the Karnak’s outward voyage through Nubia
At Abu Simbel during the first temple visit
Immediately after the boulder falls
During Poirot’s later inquiry into the killings
After Poirot identifies the murder conspiracy