Wild success of television series drives huge demand for Game Changers novels, with Australian booksellers reporting significant customer orders

A seventh book in Rachel Reid’s gay romance series that inspired the TV drama Heated Rivalry will be out later this year but Australian fans are still struggling to get their hands on a physical copy of any of the preceding six books.

Unrivalled, the next instalment in the Canadian author’s Game Changers series, will be released internationally on 29 September, the publisher HarperCollins announced on Tuesday.

The wild success of the screen adaptation has driven a level of interest in the books that rivals that of Bridgerton, booksellers have told Guardian Australia, with paperback copies of the first two novels selling out within a day and backorders piling up.

“No one has it in stock, not even the publisher!” a Dymocks spokesperson said.