I have one of these grown-up coloring books, and it was created by one of my own. Tiffany Stafford, my DIL, is a talented artist and illustrator. She has created The Bad Habit coloring book inspired by the Agent Pendergast series authored by Douglas Preston and Lincoln Child.
If you are a Lincoln and Child fan, you will delight in seeing the Pendergast characters and scenes through Tiffany's eyes. This is a collection of unique art, coloring is optional. You can find her book here, and you can learn more about Tiffany's latest projects by following her at Deranged Divine Custom Art.