The star of Michelle Huneven's new novel is Sib, who resembles Olive Kitteridge from the Strout stories ("Olive Again," "Tell Me Everything," and so on). Sib becomes an elementary-school teacher, and she feels frustrated by her colleagues' lack of ambition. She has a child, Sandro, who won't speak in class. She has another child who is capable of high-school math. She essentially bribes the math kid: I'll teach you algebra if you get Sandro to talk. Everyone wins. Despite her talent, Sib is flawed. She is an alcoholic, and she shares mean stories at the family dinner table. Having learned the IQ results of every child on the street, she tells her own daughters that they are superior. Sib delights in a tale about the neighbors but does not seem to notice undercurrents of domestic abuse within that tale. Enraged by the world, Sib stops turning up for her annual cancer screening--so she gets cancer. She decides on suicide. Her daughter, Katie, is drown...