Authors Cynthia Riggs and Tom Dresser will celebrate their mysteries on Tuesday, August 12, at 5 p.m. at the West Tisbury library.

Ms. Riggs, a 13th-generation Islander, lives in West Tisbury in her family homestead, now a bed-and-breakfast for poets and writers. Double Murder on Martha’s Vineyard combines her first two books, Deadly Nightshade and The Cranefly Orchid Murders. Her ninth book is scheduled for release next year. All of her books feature 92-year-old Victoria Trumbull, a poet sleuth based on Cynthia’s mother, Dionis Coffin Riggs.

Mr. Dresser, a former elementary school teacher and nursing home administrator, works at Featherstone will discuss his newly published book, Mystery on the Vineyard: Politics, Passion and Scandal on East Chop, an unsolved crime that took place in Oak Bluffs in 1940.

For details, call 508-693-3366.