From the description:
"Ariel has always been curious, but when she and her best friend Zeke stumble upon a mysterious old telling dart she feels an unexplained pull toward the dart, and to figuring out what it means. Magically flying great distances and only revealing their messages to the intended recipient, telling darts haven't been used for years, and no one knows how they work. So when two strangers show up looking for the dart, Ariel and Zeke realize that their discovery is not only interesting, but very dangerous. The telling dart, and the strangers, leads them to a journey more perilous and encompassing than either can imagine, and in the process both Zeke and Ariel find their true calling."
Today's offering comes in 4.6 stars but it is reviewed somewhat thinly: only 21 readers left feedback. 308 pages, for age 8/grade 3 and up