BELFAST — Left Bank Books, 109 Church St., invites the public to an in-person conversation between acclaimed writers Kathryn Miles and Tess Gerritsen Tuesday, May 24, at 7 p.m.

The event is free and no tickets are required, but there will be a cap on attendance and masks are mandatory (regardless of vaccination status).

The event is a celebration of Miles’s newest book, “Trailed: One Woman’s Quest to Solve the Shenandoah Murders,” an unforgettable narrative in which Miles recounts her four-year investigation into the still-unsolved murders in 1996 of two skilled backcountry leaders in their remote campsite in Virginia’s Shenandoah National Park, adjacent to the Appalachian Trail. The two victims, Lillie Winans and Julie Williams, had met and fallen in love the previous summer while working at a world-renowned outdoor program for women.

When Miles, an award-winning journalist and outdoors expert, began looking into the case, she discovered conflicting evidence, mismatched timelines, and details that just didn’t add up. With unprecedented access to crucial crime-scene forensics and key witnesses, Miles uncovers the truth. She is convinced that an innocent man has been under suspicion for decades, while the true culprit is a known serial killer­ — if only authorities would take a closer look.

“Trailed” is a riveting, eye-opening and heartbreaking work, offering a braided narrative about two remarkable women, the forensics of a cold case, and the surprising pervasiveness and long shadows cast by violence against women in the backcountry.

John Grisham hails the book as “A beautifully written account of a great American tragedy. I couldn’t put it down.”

Miles, a wilderness expert who taught at Unity College in Unity, Maine, the same university where Winans had studied, had been haunted by her murder for many years. In 2016, when the FBI released a public call for new information about the murders, she was assigned the story as correspondent for Outside. She said, “As a sexual assault survivor, I found emotional healing and a strong sense of self [while] backpacking on the Appalachian Trail . . . and was shattered when I learned of the murder of Lillie and Julie.”

Joining Miles in conversation is internationally acclaimed bestselling author Tess Gerritsen who is known for her medical thrillers and her series of novels featuring homicide detective Jane Rizzoli and medical examiner Maura Isles, which inspired the TNT television series “Rizzoli & Isles.” Gerritsen’s books have been published in 40 countries and more than 40 million copies have been sold.

In addition to “Trailed,” Miles has published work in The Boston Globe, The New York Times, Politico and Time. She is also a contributing editor at Down East Magazine.

To register for the free event, or to reserve copies of “Trailed,” email or call (207) 338-9009.

Tess Gerritsen Photo by David Empson