The influence of outside forces- (astrology; signs and omens) is used to suggest that all is not as calm as it is shown.

Sure, there is of course Larry's tree which the Kellers, especially Kate, attach all kinds of meaning to. Her belief is reinforced by the fact that Larry's memorial tree blew down in a storm that morning, which she sees as a positive sign. Her superstition has also led her to ask the neighbour to make a horoscope for Larry in order to determine whether the day he disappeared was an astrologically favourable day.She also attempts to interpret her crazy dreams as signs from above.