There are 21 books in the Field Trip Mysteries series.
The Field Trip Mysteries series does not have a new book coming out soon. The latest book, The Dinosaur that Disappeared (Book 20), was published in December 2009.
The first book in the Field Trip Mysteries series, The Painting That Wasn't There, was published in September 2009.
The Field Trip Mysteries 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.