One of Stan Lee’s final projects will be released as a book, after initially being announced as an audio series.

A Trick of Light will be published as a hardcover finished book in September. The book will be classified as Lee’s first-ever novel for adult readers, and marks the first foray into his new Alliances.

A Trick of Light is a superhero origin story about the unlikely friendship between Cameron, a gifted young man struggling with newfound fame after a freak accident gives him the ability to manipulate technology with his mind, and Nia, a hacker and coding genius with a mysterious past. The two must combine their powers to fight the dangerous physical and online forces threatening to wipe out the human race.

The Audible’s version will still be released on June 27th and is narrated by Yara Shahidi.

“Our yarn is filled with tantalising technologies that will make you hunger for tomorrow, while our characters strive to find the answers today,” Stan Lee writes in his introduction to A Trick of Light. “They’ll ask the questions we all have about love, friendship, acceptance, and the search for a higher purpose.”

“When Stan Lee passed away last fall, the world lost a genius whose fountain of creativity kept flowing to the very end,” added Bruce Nichols, SVP and Publisher at HMH. “We are so grateful that one of his final projects was his first-ever novel for adult readers, and we are proud and excited to be publishing it this fall.”