In a book that is as much romantic as purely scientific, David Harry Grinspoon combines historical perspective on the nearby planet Venus and data from recent observations, notably the Magellan spacecraft's detailed mapping of the planet's surface and gravitational field. In a lighthearted way, Grinspoon conveys the vast body of knowledge that scientists have recently acquired about the planet that is often called our "twin," despite its metal-melting surface temperatures and runaway greenhouse effect. (Could we learn something about our own climate in observing that of Venus?) In a fun though perhaps overconfident section, Grinspoon even argues that the likelihood that life once existed on Venus is as high as for Mars--an intriguing possibility, especially if evidence that life once existed on Mars becomes stronger.