“This weekend, it came out that J.K. Rowling had published a well-reviewed mystery novel, The Cuckoo’s Calling, under the unassuming (and very British) name of Robert Galbraith. Released in April, it had sold only 1,500 copies, an amount any given Harry Potter book has probably sold since you started reading this post.”

Huh. Who knew?

https://www.vulture.com/2013/07/how-jk-rowlings-pseudonym-was-uncovered.html