The Felicity Snell series does not have a new book coming out soon. The latest book, The Serial Sneak Thief (Book 2), was published in September 1997.
The first book in the Felicity Snell series, The Purloined Corn Popper, was published in September 1997.
The Felicity Snell series primarily falls into the Mystery genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.