The Ponson CaseFreeman Wills Crofts' second novel. When the body of Sir William Ponson is found in the Cranshaw River near his home of Luce Manor, it is assumed to be an accident until the evidence points to murder. Inspector Tanner of Scotland Yard discovers that those who would benefit most from Sir Williams death seem to have unbreakable alibis, and a mysterious fifth man whose footprints were found at the crime scene is nowhere to be found .