John Evans and Alison Reid, the owners of DIESEL, A Bookstore, will open their fourth store next month in Larkspur, California. The 2,800-square-foot bookstore, featuring knotty pine walls, a wood ceiling, a reddish cork floor, and floor-to-ceiling bookcases, will join local boutiques and artisanal cafés in the renovated Marin Country Mart open-air mall.