A rare and deeply personal journey into the secretive world of Canada’s intelligence service, told by a former senior CSIS intelligence officer.

Following 9/11, Canada joined a coalition of nations undertaking military operations in Afghanistan, calling on the Canadian Security Intelligence Service to support the mission. CSIS was tasked with building a vast network of human sources across Afghanistan to anticipate Taliban activity and support coalition operations. This perilous and complex mission—the largest overseas deployment of personnel in the organization’s history—endured for more than a decade.

CSIS operates largely in secrecy. While countless books and films have explored the clandestine work of the CIA and MI6, little has been written about Canada’s own intelligence service and the officers who carried out its most sensitive operations. In Spiders on the Ceiling, former senior CSIS intelligence officer Ruari Nicholson gives voice to the men and women who served in Afghanistan between 2003 and 2014.

This is the dramatic story of civilian intelligence officers thrust into a brutal and dangerous conflict, tasked with conducting unprecedented intelligence operations on behalf of Canada. Through vivid firsthand accounts, Nicholson offers an unprecedented glimpse into the hidden world of Canadian intelligence gathering during one of the most volatile periods in modern history.

Rich in history, human drama, and hard-earned reflection, Spiders on the Ceiling is a raw and absorbing account of courage, fear, sacrifice, and the enduring psychological weight of war.