There are 4 books in The Adventures of Marco and Carla series.
The Adventures of Marco and Carla series does not have a new book coming out soon. The latest book, The Ghost of Black Crow Bridge (Book 4), was published in July 2013.
The first book in The Adventures of Marco and Carla series, The Dark Castle, was published in August 2012.
The Adventures of Marco and Carla series primarily falls into the General Fiction genre.