This book is a nice SF mystery blend. An easy, fast read since it's a YA book, but not a simplistic mystery, which is nice. Although I was able to predict one of the big twists at the end (it might have been telegraphed a little too much!) the larger mystery remained a mystery for me until the reveal to the heroine. There was some nice exploration of friendship and prejudice, and the heroine was wonderfully adventurous and as self-reliant as a youngster could realistically be. If you like SF mysteries, you should give it a try.