In this poignant, darkly funny, and sometimes outrageous novel that is reminiscent of Zoe Heller’s What Was She Thinking?: Notes on a Scandal, Claire Messud takes us inside the angry, messy head of a frustrated, middle-aged school teacher.“ I’m not crazy. Angry, yes; crazy, no,” protests The Woman Upstairs (Knopf, $25.95), forty-two-year-old Nora Marie Eldridge, a talented artist who has set aside her craft to teach third grade in Cambridge, M.A. When she meets a new student, Reza Shahid, the childless, single Nora becomes obsessed with both the boy and his exotic parents. She insinuates herself into the family, sharing a studio with Reza’s mother—a celebrated artist in Paris, where the Shahids are from—and befriending the Lebanese father, whose fellowship at Harvard is the reason for the family’s temporary relocation. Messud painfully, deliciously captures Nora’s alienation and her desire to belong to another world.