Trustee from the Toolroom (Audiobook) (repost)

Keith Stewart, a retiring and ingenious engineer, could not have been happier in his little house in the shabby London suburb of Ealing. It was there he invented the miniature motor, the six-volt generator an inch and a half in diameter, and the tiny Congreve clock that Miniature Mechanic made such a fuss about in its columns. Then a chain of events he could not possibly have imagined sweeps him into deep waters and leads him to his happiest discover yet - he has more friends in the world than he ever could have dreamed.