Hugh North 02: The Vesper Service Murders, by Van Wyck Mason (epub/Kindle/pdf)

"Third machine gun gangster dies!" came the newsboy's cry through the window of Judge Mackaye's stately residence in Deptford. A group of men were gathered there -- powers in the life of the city, and before sundown two of them were to lie dead on the broad lawns of Deptford Manor, another was to be on the point of death, and Captain Hugh North of Army Intelligence was to take control. Murder stalked the quiet New England city -- murder whose roots lay in a strange, bizarre tangle. Murder dogged Judge Mackaye's footsteps, hounded his lovely daughter. And murder uncovered another, more terrible tragedy before it was finally checked.