The book "Joan Garry's Guide to Nonprofit Leadership Because Nonprofits Are Messy" is a comprehensive guide for nonprofit leaders, written by Joan Garry, an expert in nonprofit leadership. The book is filled with practical and humorous advice on how to manage the complexities of nonprofit organizations, including the challenges of working with boards, staff, volunteers, and donors. The book also provides a unique perspective on how to handle crises, as well as insights into the importance of creating a shared vision and building a strong team.