NEW YORK (AP) — Sabaa Tahir has more battles planned for her heroine Laia in the best-selling fantasy series "An Ember in the Ashes."

Razorbill, an imprint of Penguin Young Readers, told The Associated Press on Tuesday that it had a deal for books 3 and 4. The author's first novel, "An Ember in the Ashes," came out last year and was an immediate critical and commercial hit, with Paramount Pictures acquiring film rights. The sequel, "A Torch Against the Night," is scheduled for publication at the end of this month. Book 3 is expected in 2018.

The series is set in a world inspired by ancient Rome and tells of young Laia's fight, which leads her to disguise herself as a slave, against the tyrannical Martial Empire.