John Rhode 
In Face of the Verdict 

In Face of the Verdict, first published in 1936, is part of the series of mysteries featuring private detective Dr. Priestley. Author John Rhode, a pen name of Cecil Street (1884-1964), was a prolific writer of mostly detective novels, publishing more than 140 books between 1924 and 1961. In Face of the Verdict, Dr. Priestley is called to the harbor town of Blacksand to find the killer of two brothers, both of whom died by drowning.