I wish this book had been around when I was in my early teens. You have two things inside these covers - a whodunit suitable for readers of ten and up, and a novel about growing up. On one hand Ingrid is busily solving a crime (hardly new perhaps, Nancy Drew did this) but bringing the book sharply up to date is the concurrent story of Ingrid finding out that life isn't quite what she thought. No longer does her teddy bear comfort her, and her parents and older brother have lives and problems of their own. One old playmate is part of the ranks of the rich, while her best friend lives in a very different part of town to middle-class Ingrid. There is humor in here, and a lot of humanity and who can resist the character of irascible Grampy, who is finding his own solution to his problems. Intended for the younger end of the market, but it is a novel with plenty of appeal to adults as well. A genuinely intelligent and entertaining book for young teens.