At eight o'clock on Sunday morning, Arthur Peachey unlocked his front door, and quietly went forth. He had not ventured to ask that early breakfast should be prepared for him. Enough that he was leaving home for a summer holiday-the first he had allowed himself since his marriage three years ago. It was a house in De Crespigny Park; unattached, double-fronted, with half-sunk basement, and a flight of steps to the stucco pillars at the entrance. De Crespigny Park, a thoroughfare connecting Grove Lane, Camberwell, with Denmark Hill, presents a double row of similar dwellings; its clean breadth, with foliage of trees and shrubs in front gardens, makes it pleasant to the eye that finds pleasure in suburban London. In point of respectability, it has claims only to be appreciated by the ambitious middle-class of Camberwell. Each house seems to remind its neighbour, with all the complacence expressible in buff brick, that in this locality lodgings are not to let.