October 9

October 9 matters because it places a final, unexplained trace of activity on Jonas Landahl’s computer after witnesses said he had left for Poland. The date does not establish who was present or what was done: the files investigators opened were empty, and no witness could account for everyone’s movements that day. Instead, October 9 becomes the hinge of competing reconstructions, linking a departure that seemed settled to a computer whose contents and last use were not.

Calendar Position and the Uncertain Interval

The investigation places October 9 on a Thursday. Ann-Britt Höglund and Kurt Wallander compare it with the reported departure to Poland: if the neighbour’s account and the taxi driver’s information are reliable, Jonas Landahl left on Wednesday, the day before. That sequence makes the computer’s recorded activity difficult to explain. It could indicate that Landahl came back, but the date alone cannot show that he did.

The neighbour confirms that the boy left on Wednesday, yet saw no one on October 9. Wallander recognizes the limit of that negative evidence: the neighbour could not spend every waking moment watching from the kitchen window. His failure to see anyone therefore neither confirms Landahl’s return nor rules it out. The timeline offers a discrepancy, not an alibi or an identification. That distinction matters because the date initially seems precise while the human observations around it remain incomplete.

The Computer’s Last Trace

At Landahl’s house, Höglund checks the computer’s activity information and finds that its last recorded use occurred on October 9. The visible files do not explain the trace. The correspondence file and other files she opens are empty; the computer has no password or security barriers, and the investigators find no diskettes during their initial search. Empty files could mean that nothing was stored, or that someone had emptied them.

Höglund explains that deleting material need not erase every trace of it. She compares the computer to a room stripped of furniture, where marks remain, and to a cellar in which deleted data may persist until the hard drive is destroyed. Wallander understands the broad implication, although not the technical process: the computer’s contents might still be reconstructable. For his immediate inquiry, however, the decisive fact is simpler. Someone used the machine on October 9, and its apparent emptiness cannot be treated as proof that it had contained nothing.

Competing Reconstructions

Wallander and Höglund consider whether Landahl returned or another person came into the house. Because the computer lacked a password, a visitor could have accessed it and emptied its files. Höglund adds that someone who had already bypassed security could also have removed traces of a barrier. These are possibilities, not findings; the date identifies an occasion for activity but not the user, purpose, or sequence of actions.

Wallander later develops another possibility: Landahl may have erased the material himself, followed by a second visit from someone checking that the erasure had been completed. This version allows for two separate acts rather than a single return, but the evidence available to him does not settle it. Nor does the neighbour’s inability to report a visitor on October 9 resolve the question. The uncertainty persists precisely because the computer gives a record of activity without supplying a person to match to it.

Investigative Significance

The date becomes a priority because Wallander believes that explaining the October 9 computer use may unlock the wider case. He asks Höglund to recheck the neighbour’s account and to establish whether anyone else was seen that day; he also directs Nyberg to search the house thoroughly for diskettes. A later search of the boy’s bedroom finds a diskette concealed beneath a bookcase propped slightly away from the wall by small washers. Its label begins with Jacob’s, recalling the name of a game icon Höglund had noticed on the computer. The discovery supplies a physical lead, but it does not by itself establish that the diskette was used on October 9.

The date also sits alongside other unresolved clues. Martinsson reports that Robert Modin regards the number 20 as significant and believes the code consists of two words, or perhaps a number and a word. Wallander has no demonstrated connection between that code and October 9, but both the date and the unexplained computer traces keep the investigation focused on information that has been concealed, erased, or left only in fragments. Later, Wallander still treats Jonas Landahl as a suspect and considers that he may have driven Sonja Hökberg to the substation before setting out for Poland; he nevertheless acknowledges that Landahl may not have been the driver or her killer. October 9 therefore remains a crucial investigative marker rather than a solved episode: it exposes a gap in the departure story and directs attention to the computer, while leaving the person behind its last activity unknown.