Problematic Summer Romance is the second book in Ali Hazelwood's "Not in Love" series, published by Berkley (Penguin Random House) on May 27, 2025. An instant #1 New York Times Bestseller, this 416-page contemporary romance follows Maya Killgore, a twenty-three-year-old physics graduate student, and Conor Harkness—a thirty-eight-year-old biotech entrepreneur and her brother's best friend—as they navigate an undeniable but complicated attraction.

When Maya's brother plans a destination wedding in Taormina, Sicily, Maya and Conor find themselves sharing a romantic villa on the Ionian coast for over a week. Surrounded by ancient ruins, stunning scenery, and local flavors, Maya begins to suspect that Conor may be hiding something. As the wedding festivities spiral out of control, she decides a summer fling might be just what she needs—even a problematic one.

Written in Hazelwood's signature witty, science-forward voice, the novel blends forced proximity, an age-gap romance, and a richly atmospheric Italian setting. An audiobook edition narrated by Elizabeth Lamont and Eric Nolan is also available, running 11 hours and 34 minutes.