Death on Herons' Mere

Mr Gabb, your son did not commit suicide. He was murdered.'

Simon Gabb has everything - or so it seems: a beautiful house on a large estate, a flourishing business and two sons, both evidently endowed with the capacity to carry on the family firm. One is brilliant and inventive, the other dependable and efficient. And yet something is manifestly wrong. A secret invention, on which his business is engaged for the government, becomes known to those who have no right to such information. But ho...