The Haunted series does not have a new book coming out soon. The latest book, The Ghost Miner's Treasure (Book 4), was published in November 2012.
The first book in the Haunted series, The Ghost on the Stairs, was published in August 2009.
The Haunted series primarily falls into the General Fiction genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.