four o'clock exactly
Still , to the best of his belief , the case had beaten both these doughty representatives of Scotland Yard ; there was yet a chance for the humble police-constable ; so Robinson squared his shoulders , seamed his brows , and marched majestically down the Knoleworth road . He had an eye for The Hollies , of course , though neither he nor anybody else could discern more than the bare edge of the lawn from bridge or road , owing to the dense screen of evergreen trees and shrubs planted by the tenant who remodeled the property . But the spot where the body of Adelaide Melhuish was drawn ashore was visible , and the sight of it started a dim thesis in the policeman 's mind which took definite shape during less than an hour 's stroll . Thus , at four o'clock exactly , he was pulling the bell at The Hollies . Almost simultaneously , Mr. Siddle knocked modestly on the private door of the post office , to reach which one had to pass down a narrow yard . `` Mr. Grant at home ? '' inquired Robinson , when Minnie appeared .