Basaltic lava rock sample

The Basaltic lava rock sample is a pair of small, porous black stones recovered from the basement where Borgny Stem-Myhre was murdered. They are significant because they survive as an anomalous physical trace at a scene nearly emptied of other forensic evidence: their composition points beyond Oslo, and their eventual association with Congo-Kinshasa joins the murder investigation to the novel’s wider web of violence, mineral wealth, and deliberate misdirection. Their evidentiary value is real, but their meaning is not self-evident; identifying the rock is only the beginning of interpreting it.

Discovery and Physical Evidence

The stones appear in the later review of the forensic report on Borgny Stem-Myhre’s death. The report contains photographs of two small gray-black stones found on the concrete floor. They did not match the gravel at the scene. The floor had been cleaned the previous day in preparation for heating cables and new flooring, and investigators had found no fingerprints, DNA, or shoe or boot impressions. Against that absence, the stones stand out as a rare material trace left behind in a space otherwise offering little to follow.

The report offers a possible route by which they arrived there, not a proven account. Stones can lodge in the deep tread of boots and fall out when the wearer walks onto a hard surface such as concrete. The medical examiner considered the specimens unusual enough to preserve as possible evidence, including for comparison with similar stones later found elsewhere, such as in driveway gravel. This makes the sample potentially useful in two directions: it might help identify a place or environment associated with the stones, or allow investigators to connect a later discovery to the basement. Neither possibility, by itself, identifies who carried them or when they were deposited.

Analysis and Geological Identification

When Harry Hole asks Björn Holm about the stones, Holm reports that they have been analyzed: they contain substantial iron and magnesium, with smaller amounts of aluminum and silicate, and are porous black basalt. The description sharpens the anomaly but does not yet make it a location. Harry proposes that the material may be lava and asks Holm to find a volcanologist; the investigative hunch turns a miscellaneous trace into a question that specialist knowledge can address.

Holm locates Felix Rost, a volcanologist associated with the Geological Institute who travels to observe volcanoes and eruptions. Rost is away, and his sister, Frida Larsen, relays his assessment after he receives the stones and their analysis. The sample is mafic basaltic lava: once molten at more than a thousand degrees, it would have been fluid enough to spread rapidly after an eruption. It is not the old lava beneath Oslo. Rost estimates that the material is between five and fifty years old, but warns that its source cannot be identified easily. There are more than fifteen hundred known active volcanoes, and that count excludes volcanoes not yet known to science. The geological answer therefore narrows the question without resolving it: the stones are fresh volcanic material, but their origin still has to be traced.

From Lava to Nyiragongo

A later message from Felix Rost supplies a more specific lead: Nyiragongo Volcano, whose most recent eruption was in 2002 and whose crater is one of the few to contain an open lava lake. The volcano is in Congo-Kinshasa, near Görna City. The message makes a geographic connection possible, but it does not amount to a demonstrated match between the basement stones and a particular eruption or lava flow. The distinction matters: a basaltic composition and an age estimate direct the investigation; the proposed source remains an inference rather than a forensic identification stated as certain.

That lead resonates with other evidence in the murder investigation. Borgny Stem-Myhre and Charlotte Lolles had iron and coltan traces on the insides of their teeth, and investigators understood those traces to indicate use of the same unusual weapon. Harry also learns that coltan, used in mobile phones, is largely associated with deposits in Congo-Kinshasa, where mineral extraction is entangled with armed conflict. The stones and the metallic traces are different clues, not interchangeable proof. Together, however, they make the Congolese setting more than a distant name: the rock points toward volcanic geography, while the coltan connects the murders’ material evidence to a resource and region already implicated in the case.

Evidentiary Value and Misdirection

The sample’s importance lies partly in how the investigation learns to read it. At first, two dark stones on a cleaned concrete floor offer no obvious narrative. Laboratory analysis supplies properties; geological expertise supplies a possible class of origins; a specialist’s message supplies a candidate volcano. Each step adds information, but none alone answers the central questions of who brought the stones to the basement, what they were doing there, or whether their presence records the murderer’s movements. The stones are useful precisely because they are concrete, while the explanations attached to them remain provisional.

Their Congolese association also sits within a larger trap. Tony Leike has a coltan venture in the region, and other evidence appears to point toward him: an incriminating telephone connection to Elias Skog and the fact that the murder weapon was obtained in Congo. Beate Lønn raises the convergence as a reason to question Leike’s alibi. Harry then argues that the Kavalier deliberately paid Juliana Verni to travel to Congo-Kinshasa, knowing that a trail leading there would draw suspicion toward Leike. The stones should therefore not be treated as a simple arrow from a murder scene to a culprit. They help establish the importance of a geographic connection, but in a case where evidence can be staged or exploited, location is not identity. Their narrative force comes from that tension: a small, materially specific clue opens a vast field of inquiry, yet the trail it helps illuminate can also be used to mislead.