Among the Mad by Jacqueline Winspear

At the end of the First World War many men returned to civilian life suffering from what was termed "shell shock" which today would probably be termed Post Traumatic Stress Disorder. By 1931 when this book is set it's effects were still being felt by many ex-soldiers which made it almost impossible for them to find work in an economy mired in depression. One ex-soldier tries to force the hand of government into alleviating their distress by means of violent action. Purely by chance Maisie Dobbs finds herself drawn into the investigation run by Scotland Yard's Special Branch and is there just a hint of romance between her and Chief Superintendant MacFarlane? Whatever! This is another excellent detective story from Miss Winspear.