LIVERMORE FALLS — Kathy Lynn Emerson, award-winning mystery author and member of Sisters in Crime, an international organization founded to support the professional development of women writing crime fiction, will work as a volunteer staffer at Treat Memorial Library in Livermore Falls on Saturday, April 21, from 10 a.m. until 2 p.m. as part of a “Booksellers and Librarians Solve Mysteries Every Day” celebration.

The event, produced by Sisters in Crime, is designed to thank librarians and booksellers for 25 years of support of the mystery genre.

“I am very excited about spending time at Treat Memorial Library,” Emerson said. “In helping readers find their way to the right book at the right time, librarians solve mysteries every day.”

On April 21, a select group of Sisters in Crime member authors will be volunteering in bookstores and libraries in their hometowns from Albany, New York, to Honolulu, Hawaii, starting at 10 a.m. local time. In addition, SinC’s more than 3,000 members worldwide are gearing up to go into libraries and bookstores on that day to personally thank the booksellers and librarians they find working behind the counters and in the stacks.

Emerson, who wrote the Agatha-award-winning “How to Write Killer Historical Mysteries,” currently writes the Liss MacCrimmon Scottish-American Heritage Mysteries under the pseudonym Kaitlyn Dunnett.

The most recent in this series is “Scotched,” set in the fictional village of Moosetookalook, Maine. She also writes historical fiction under the name Kate Emerson. The most recent of these is “At the King’s Pleasure,” a novel set at the court of King Henry VIII.