How does the author use foreshadowing in Smilla's Sense of Snow?

Much of the foreshhadowing is told through a series of flashbacks. In the first, Smilla recounts returning late one December afternoon to the White Palace, the apartment complex where she, Isaiah, Juliane, and Føjl live, to find Isaiah dead on the ground and police all over the scene. Føjl, the first person to find him, is also there, crying. Although the police call Isaiah's fall an accident, Smilla believes it to be foul play for two important reasons: first, Isaiah was terrified of heights and would never have been on the roof except to escape from someone intent on doing him harm; and second, when Smilla reads the footprints in the snow, she knows he has jumped off the roof, not fallen, for some unknown reason, most probably to escape from someone or something that frightened him badly.