There are 4 books in the Between the Lines series.
The Between the Lines series does not have a new book coming out soon. The latest book, Here Without You (Book 4), was published in August 2013.
The first book in the Between the Lines series, Between the Lines, was published in April 2011.
The Between the Lines series primarily falls into the Contemporary Romance genre. This young adult series was written for ages 12-17, but can be enjoyed by adults too.