Malcolm Cook, fat and funny senior Crown prosecutor, meets Sarah Fortune, recently widowed, at a London dinner party. Sympathetic Sarah frees the obese Cook from self-pity, then disappears. He trims down, energizes himself, and, two years later, searches for Sarah, now a free-spirited lawyer with several ``kindly'' male clients in the wings. Unknown to her, however, her firm's most important (and dangerous) client keeps her under surveillance as a possible replacement for his missing wife. Detailed with depth and dexterity, Fyfield's very human characters gradually reveal themselves as the plot advances. More talented, absorbing work from the author of Not That Kind of Place ( LJ 3/1/90) .