Why are the Colberts unable to settle down in one place in the novel, In the Middle of the Night?

The town of Barstow is the Colbert family's latest refuge from the relentless harassment for the events at the Globe that had occurred twenty-five years before. The family would very much like to settle down permanently in the community, but Lulu's calls continue, and there are indications that she is only one of many others who follow the movements of the Colbert family with the intent to cruelly harass them. News media interest increases as the twenty-fifth anniversary of the deaths of the twenty-two children approaches; the Colberts seem to be besieged to the point of possibly having to move again.