This is a straight forward adventure story – nothing special but well written none-the-less. Pub 1988, reprinted 92. Suitable for boys and girls in years 4 to 6. Less than 30,000 words. A brother and sister get a bad horoscope and then everything bad happens to them. Almost killed in a plane crash. Almost attacked by a shark. They stumble across abalone poachers. They help save a diver who has the bends. There are some obvious parts where the author wanted to include some of his research – apart from that it is good.