The gentleman tied to the lamppost on Westminster Bridge is most elegantly attired-fresh boutonniere, silk hat, white evening scarf-and he is quite, quite dead, as a result of his thoroughly cut throat. Why should anyone kill Sir Lockwood Hamilton, the kindest of family men and most conscientious member of Parliament? Before Inspector Thomas Pitt can even speculate on the reasons, a colleague of Sir Lockwood's meets the same fate in the same spot. Public indignation is boundless, and clever Charlotte Pitt, Thomas's wellborn wife, can't resist helping her hard-pressed husband, scouting society's drawing rooms for clues to these appalling crimes. Meanwhile, the Westminster Bridge Cutthroat stalks another victim.