This is the definitive book on derivative houses, an astrological technique that yields amazingly accurate results. Want information about your nephew's finances? Your partner's coworkers? Your grandmother's neighbor? Your child's friends and teachers? Sophia Mason explains the ins and outs of derivative houses, the time-honored technique that makes it possible, using your astrological chart, to forecast events in the lives of everyone from your mate to your boss to your friends, coworkers and in-laws.