The product is a lot of 5 Mary Stone novels from the Shadow Island series, including the titles "Shadow's Secret" "Shadow's Captive," "   "Shadow's Deadline", "Shadow's Force" and "Shadow's Watch". These thriller and mystery novels are intended for an adult audience and are in English, with a trade paperback format. Written by Mary Stone in the 2020s in the United States, these novels offer an engaging narrative in the fiction genre, perfect for fans of suspenseful and intriguing storytelling.