Book is a former school/library book with wear and tear and markings - see pics. Missing dust jacket. The death of an independent asteroid miner would be no unusual news to the Martian colony. Asteroid mining was gambling, for high stakes, with your life in constant jeopardy. But when Roger Hunter's mangled body was found in the exploded wreck of his ship, his two sons found reason to suspect murder. Their father appeared to have made a discovery which would affect the course of history. Suddenly, certain space pirates found they had to cope with a ghost that belonged to the past, and a weapon that belonged in the future.