Robert Goddard: Closed Circle (UK 1994)
From the Publisher:
It's a trick they've pulled before, with some success. Charm the daughter into an engagement to marry, then get the father to buy you off. So confident are they of success, in fact, that they make a pact: whichever of them wins Diana Charnwood's love will share his fortune with the other. Who would imagine that these smooth operators would let their hearts rule their heads? Or that violent death would find its way into their neat little scheme? Or that they would stumble into something much darker and deeper than either had suspected?
Robert Goddard: Closed Circle. Corgi Books, ISBN: 0552138401 (December, 1994), 352 p., £5.99 (?)/£6.99.