Lauren Oliver to Write Her First Adult Book.

Lauren Oliver, the 29-year-old author of best-selling teenage novels, will write her first novel for an adult audience, her publisher said on Thursday. Ecco, part of HarperCollins, has acquired ''Rooms,'' which will be released in fall 2014. Lee Boudreaux, who will edit the book, said it was ''as instantly gripping as it was elegantly written, filled with characters and predicaments I still can't get out of my head a week later.'' Ms. Oliver is the author of three young-adult novels, ''Before I Fall,'' ''Delirium'' and ''Pandemonium,'' and a middle-grade novel, ''Liesl and Po.'' [ABSTRACT FROM PUBLISHER]