The Scarlet and Ivy series does not have a new book coming out soon. The latest book, The Last Secret (Book 6), was published in January 2019.
The first book in the Scarlet and Ivy series, The Lost Twin, was published in March 2015.
The Scarlet and Ivy 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.