Book excerpt: This important book examines the role, behaviours and management practices of middle managers operating within the context of collaboration – complex inter-organizational and multi-sector settings that demand cross-boundary governance, policy and practice to tackle challenging contemporary societal problems and issues. Presenting new evidence and offering perspectives from both the public and private sectors, the author critically explores the main themes that are integral to the management challenges facing this cadre of managers. The book sets out the implications of this research for policy and practice and offers practical recommendations to policy makers and managers working in this area.