John Russell Fearn 
Exccept for One Thing 

Many criminals have often believed that they’d committed the ‘Perfect Crime’, and blundered. Chief Inspector Garth of Scotland Yard is convinced that modern science gives the perfect crime even less chance of success. However, Garth’s friend, scientist Richard Harvey, believes he can rid himself of an unwanted fiancee without anyone discovering what became of the corpse. Yet though he lays a master-plan and uses modern scientific methods to bring it to fruition, he makes not one but several mistakes…