Original sentence: His novel The Hollow Man is considered by many to be the finest locked room mystery novel of all time—although Carr himself names Gaston Leroux's The Mystery of the Yellow Room as his favourite.One of the masters of the locked-room subgenre is John Dickson Carr
Edited sentence: His novel The Hollow Man is considered by many to be the finest locked mystery novel of all time—although Carr himself names Gaston Leroux's The Mystery of the Yellow Room as his favourite.The absolute master of the locked-room subgenre is John Dickson Carr