I almost want to give this four stars, as I was so surprised by how much I liked it. But really, it is a junior version of a mass-market/ bestseller thriller. Molly is just a bit too smart & level-headed & brave to be believable, and all the interpersonal conflict comes together just as smoothly as the mystery gets solved.
But it only took me a little over an hour to read, and was a worthy read for, for example, a youngster who is either reluctant to read or reads everything they can get their hands on. Recommended if you're interested.
Oh, also recommended if you're interested in alpaca ranching.