Sister by Rosamund Lipton

From Library Journal: "Written in the form of a letter from Beatrice, the older, more substantial sister, to her younger, bohemian sibling, Tess, the narrative reveals within the first few pages that Tess has gone missing and is found dead. Bea and Tess, even with a big age difference and an ocean between them, were incredibly close, so when Bea receives the "phone call," she drops everything and races from New York City to London. Although Tess's death is ruled a suicide, Bea knows her sister would never kill herself. As Bea frantically tries to find the murderer, in the process losing pieces of herself, the reader is catapulted into the search." The New York Times Book Review calls Sister "Both tear-jerking and spine-tingling... provides an adrenaline rush that could cause a chill on the sunniest afternoon." Check it out!