In the fall of 1948, Ernest Hemingway and his fourth wife traveled for the first time to Venice, which Hemingway called "absolutely god-damned wonderful." A year shy of his fiftieth birthday, Hemingway hadn't published a novel in nearly a decade when he met and fell in love with Adriana Ivancich, a striking Venetian girl just out of finishing school. Here Andrea di Robilant re-creates with sparkling clarity this surprising, years-long relationship,...