Three celebrated authors, including a national health expert, will visit the Decatur Library in the coming days as part of library’s May Festival of Writers.

Writing duo Douglas Preston and Lincoln Child, whose newest novel “Cemetery Dance” follows enigmatic special agent Pendergast on his investigation of a murderous New York City cult, will be at the library on May 23 at 2 p.m. Preston and Child have also penned “Relic,” “Reliquary” and “The Book of the Dead.”

Robyn O’Brien, a children’s health and food allergies specialist, will be at the library on May 27 at 7:15 p.m. She will discuss her new book “The Unhealthy Truth: How Our Food Is Making Us Sick – and What We Can Do About It.”

The tome details O’Brien’s transformation into a one-woman crusader seeking to identify food allergies that affect children. It also explores her discovery of shocking truths about toxicity in American food systems.

O’Brien, who has been featured in “The New York Times” and on CNN, is also the founder of AllergyKids, an organization devoted to raising awareness about food toxins.

Both events are free.

The Decatur Library is at 215 Sycamore Street in downtown Decatur. For more information, call 404-370-8450, ext. 2225.