Cherie Waggie All the books are fun, especially for young readers. Each one has a different mystery that Trixie and her friends solve. If you haven't, read them all. The ones by Julie Campbell are the best. I have all in hard cover, and the covers are quite different from the ones I see listed. These are the original book designs, when the books were first published, I think. And I've been rereading them since getting them out of storage. I was 13 when I was given my first Trixie Belden book. I'm 61 now and I still enjoy them.