The Dark Tower: The Wind Through the Keyhole

The Dark Tower: The Wind Through the Keyhole (also known as Dark Tower 4.5) is a fantasy novel by American writer Stephen King, first published on February 21, 2012 by Grant as a limited edition, and later published by Scribner as a trade hardcover (ISBN 978-1451658903) on April 24, 2012, with ebook and audiobook editions. The audiobook is read by the author. As part of The Dark Tower series, it is the eighth novel, but chronologically set between volumes four and five. First mentioned by King in 2009, after the series had been proclaimed as concluded in 2004 with the publication of the seventh novel, it was announced on the author's official site on March 10, 2011. A short excerpt was released online on December 19, 2011, the day the limited edition of the novel became available for pre-order.

Question: is the wind through the keyhole part of a series
Answer: yes