Robert B. Parker's The Bridge (A Cole and Hitch Novel)

Territorial Marshals Virgil Cole and Everett Hitch are back in Appaloosa, where their work enforcing the law has been exceptionally quiet. All that is about to change. An ominous storm rolls in, and along with it a band of night riders with a devious scheme, who show up at the Rio Blanco camp, where a three-hundred-foot bridge is under construction.