The return of Captain John Emmett

If I am straddling the fence on Mr Churchill's Secretary, I am not about Speller's The return of Captain John Emmett. Set after WWI, it is a mystery that will appeal to Maisie Dobbs and Ian Rutledge readers. It is well written and fully rounded characters. Bertram Lawrence survived the war in theory, but experience at the front and death of his wife and child have led him to hide from the world. Mary, the sister of a friend, asks him to look into the suicide of her brother. What will he find? Is anything as simple as it seems?