British actor Theo James and U.S actress Shailene Woodley arrive for the German film premiere of “Divergent” in Berlin, Tuesday, April 1, 2014. (Photo credit: AP photo by Markus Schreiber)

The Associated Press

NEW YORK — It’s good news for novelist Veronica Roth: “Divergent” is a hit at the box office and a blockbuster at book stores.

A spokeswoman for HarperCollins Children’s Books said Tuesday that the young adult series set in a dystopian future has been selling 500,000 copies a week over the past three weeks.

The movie “Divergent” is based on the first book and stars Shailene Woodley, Theo James and Kate Winslet. The action-thriller was released March 21 and has already made nearly $100 million.

The first “Divergent” book was published in 2011, and total sales for the series now exceed 18 million copies.