When fifty-one-year-old Nathan Smith, a once-confirmed bachelor, is found in his bed with a hole in his head made by a.38-caliber slug, it's hard not to imagine Nathan's young bride as the one with her finger on the trigger. Even her lawyer thinks she's guilty. But given that Mary Smith is entitled to the best defence she can afford - and thanks to Nathan's millions, she can afford plenty - Spenser is hired to investigate Mary's bona fides. Mary's alibi is a bit on the flimsy side: she claims she was watching television in the other room when the murder occurred. But the couple were seen fighting at a high-profile cocktail party earlier that evening, and the prosecution has a witness who says Mary once tried to hire him to kill Nathan. What's more, she's too pretty, to made-up, too blonde, and sleeps around - just the kind of person a jury loves to hate. Spenser's up against a wall; leads go nowhere, no one knows a thing. Then a young woman, recently fired from her position at Smith's bank, turns up dead. Mary's vacant past suddenly starts looking meaner and darker - and Spenser's suddenly got to watch his back. With lean, crackling dialogue, crisp action, and razor-sharp characters, Widow's Walk is another triumph.