Promenade with Death — Cecilia Peartree

This is the 14th novel in the Pitkirtly Mystery series, set in a fictitious small town on the coast of Fife.
When an amateur theatre group plans a promenade performance on Pitkirtly Island in the dark - on Hallowe'en - this seems to Amaryllis like a recipe for disaster, so naturally she pays close attention to the project.
By the time it is over, several people's lives have been changed forever, and at least one case a life has come to an abrupt end.
Warning: this book may not be suitable for readers of a nervous disposition and those who love Shakespeare!