Jan and Jenny are off on yet another adventure in this eighth book of the "Jan and Jenny Series." This mystery/adventure seems to be the most original of all their adventures to date, because our two sleuths make a brand new scientific discovery They are very excited about the find because, like the two of them, this discovery is one of a kind Find out what it means to be best friends and to stick together no matter what. What is a lucky penny and how does a lucky penny fit into this story? And since there is no villain in this book, why are the girls in danger again?" Written by award...