What is the author's tone in Running Out of Time by Margaret Peterson Haddix?

The novel has many different tones. It starts out very emotional. The author wastes no time in getting to the root problem of the story. The Clifton children are not getting medicine and a sickness is striking the village. As Ma tells Jessie that she should leave the village to go get help, the tone gets extremely urgent. Jessie knows that she is fighting against time to make sure that all the children in Clifton survive. After Jessie is out of Clifton, the tone of the novel is one of wonder. She cannot believe everything she is learning in the 1996 world. When Jessie is confronted by the man from the phone booth, the boys on the highway, and Mr. Neely's betrayal, she is filled with fear and the book takes on a fearful tone. As Jessie thinks about her home and all the ways the adults of Clifton have lied to her, she feels anger and confusion.