A Grijpstra & De Gier Mystery Grijpstra and De Gier are being blackmailed. A wealthy yacht owner and his son want the retired policemen to investigate the hijacking in the Caribbean of an entire cargo of oil from a supertanker and are threatening to reveal information they have on them to the tax authorities. Their rendezvous is Key West where, amongst other things, they are confronted by a murder. One of the masters of the mystery form.' - Los Angeles...