Skeleton Hill - Peter Lovesey

Battle and burial are built into the history of Lansdown Hill, so it is no great shock when part of a skeleton is unearthed there. But Peter Diamond, Bath's Head of CID, can't ignore the fresh corpse found close to the folly known as Beckford's Tower. The hill becomes the setting for one of the most puzzling cases he has investigated, involving golf, horseracing, Civil War re-enactment and the Cyrillic alphabet.

Inevitably, Diamond butts heads with the group of vigilantes who call themselves the Lansdown Society, discovering in the process that his boss Georgina is a member. She resolves to sideline Diamond by sending him to Bristol and handing the skeleton investigation to his deputy, Keith Halliwell. Fortunately matters don't pan out as Georgina plans...