Elena Ferrante, the Italian writer whose Neapolitan quartet of novels have sold more than 11 million copies worldwide and inspired last year’s HBO series “My Brilliant Friend,” has a new book slated for publication in the United States next year.

The book, “The Lying Life of Adults,” will come out on June 9, 2020, her United States publisher, Europa Editions, announced Monday. It is expected to be published next month in Italian.

“The Lying Life of Adults” will be Ms. Ferrante’s 10th book. According to Michael Reynolds, her editor at Europa, it will center on similar themes to her other books, which have explored female friendship, motherhood and class.

Ms. Ferrante, who writes under a pseudonym, has gained a following over the last few years for her Neapolitan series, starting with the 2012 novel “My Brilliant Friend.” The four books, which include “The Story of a New Name,” “Those Who Leave and Those Who Stay,” and “The Story of the Lost Child,” all follow the lifelong friendship of two women from Naples. The books have been released in dozens of countries — 2.5 million copies sold in the United States — and have prompted passionate debate about their story lines as well as the identity of their author. In a 2014 interview, Ms. Ferrante told The New York Times that she writes “to put my writing on display, not me.”