Over the weekend, The Sunday Times revealed that Harry Potter creator J.K. Rowling was the true author of a well-received detective novel written under the pseudonym Robert Galbraith. The Cuckoo’s Calling had sold about 1,500 hardback copies since its April release, but when Rowling’s identity was revealed on Sunday, the book raced to the top of sales charts on Barnes & Noble and Amazon in both the U.S. and the UK. By Monday afternoon European time, the hardcover edition was listed as “temporarily out of stock” on both U.S. sites. The detective novel centers on war veteran Cormoran Strike who turns private investigator after losing a leg in Afghanistan. He’s barely scraping by when he’s asked to look into the death of a legendary supermodel. Rowling told The Times she’d hoped “to keep this secret a little longer because being Robert Galbraith has been such a liberating experience. It has been wonderful to publish without hype or expectation, and pure pleasure to get feedback under a different name.” The book was published in the UK by Little Brown’s Sphere, also the publisher of Rowling’s The Casual Vacancy which is being made into a BBC series. In the U.S., Little Brown imprint Mulholland says it will publish a second book in the series next summer and that The Cuckoo’s Calling is being reprinted, The Wall Street Journal reported.