The Tripper and Sam series does not have a new book coming out soon. The latest book, The Ghost Who Wanted to Be a Star (Book 3), was published in April 1987.
The first book in the Tripper and Sam series, The Phantom Film Crew, was published in August 1986.
The Tripper and Sam series primarily falls into the Suspense genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.