Book excerpt: Harriet Rose, 26, is an American photographer just winning recognition for her work. A travel fellowship brings her to visit her best friend and former roommate, Anne Gordon, in Switzerland. In an ongoing letter to her boyfriend, Harriet reports on strange developments in Anne's life, most notably her affair with a much older married man, which seems to be leading to a disastrous conclusion. Before she can rescue Anne, events take a series of unexpected turns, and Harriet must reexamine her own life and past, and come to terms with the difficulties and possibilities of human relationships. Already excerpted in The New Yorker, Katharine Weber's witty first novel of attraction and deception, a tale with the sensibility of a Margaret Atwood, pulses with cultural references and word games that echo Nabokov.