Step into the world of classic British crime with ' The Wrong Letter ' by Walter S. Masterman, a brilliant example of locked room mystery and detective fiction from the golden age of crime literature. The story opens with a chilling phone call to Superintendent Sinclair of Scotland Yard: a mysterious voice announces the murder of Sir James Watson in his own home, bluntly stating, ' I am the murderer. ' Joined by the amateur sleuth Sylvester Collins, Sinclair arrives at the Watson residence to find Sir James dead in a locked library shot in the head, with no weapon in sight. The investigation quickly reveals a web of family secrets. Sir James, a widower and recluse, fiercely opposed his daughter Mabel's relationship with his secretary Eric Sanders, while his son Ronald has vanished after a heated quarrel. As a deranged suspect confesses, strange events haunt the Watson household and the press leaks damaging details. Masterman skillfully weaves red herrings, moral dilemmas, and relentless suspense, crafting a murder puzzle where every clue from the missing revolver to the anonymous letters draws the reader closer to a daring solution. This golden age crime novel blends the elegance of classic mysteries with sharp social critique. The dynamic between the methodical Sinclair and the intuitive Collins recalls legendary detective duos, while key scenes such as the dramatic opening of the locked room will delight fans of impossible crimes. With a preface by G.K. Chesterton, ' The Wrong Letter ' combines psychological tension and ingenious twists, earning its place among the essential works of detective fiction.