Gray Matter by Becky McGraw is absolutely spell-binding. Ms McGraw has delivered a well-written book and loaded it with amazing characters. Kudos to Ms McGraw for weaving a story with enough suspense, action, humor and sizzle to keep readers tied to Gray and Mickie's story. Their tale left me satisfied with the HEA and sad to reach the end of the book. I totally enjoyed Gray Matter and look forward to reading more from the talented Becky McGraw in the future. Gray Matter is book 5 of the Deep Six Security Series but can easily be read as a standalone. This is a complete book, not a cliff-hanger.