Tom DeLonge has announced the release of Sekret Machines Book 2 – A Fire Within, the second in a three-volume series of fiction novels.

Read more: Tom DeLonge’s TTS Academy shares controversial UFO video

Co-written with New York Times bestselling author A.J. Hartley, A Fire Within is a “complex and thrilling read based on facts and actual events gleaned from the authors’ sources within the scientific, military and intelligence communities surrounding unidentified aerial phenomena.”

“One of the largest areas of study when dealing with the UFO phenomenon is consciousness and the human mind,” says DeLonge. “A.J. was able to weave that into the storyline with a tapestry of information never before released. He’s providing us with an opportunity to learn more about ourselves and the greatest story never told.”

Read a synopsis of the novel below:

A Fire Within continues the story of heiress Jennifer Quinn, journalist Timika Mars, pilot Alan Young and ex-Marine Barry Regis – four people bonded by the incidents they’ve witnessed and who are being hunted by agents of a wealthy corporate cabal desperate for unimaginable power and possessed of extraordinary abilities they don’t understand, much less control. Now the quartet is on a mission of their own: as Alan and Barry test the limits of their strange gifts inside the military complex known as Dreamland, Jennifer and Timika begin a quest to locate an ancient tablet that may hold the answers to humanity’s greatest question: Are we alone in the universe?

A Fire Within is due out Sept. 18, and it's currently available for preorder here.