The U-boats constituted a serious threat to North American security and a major challenge to coastal and convoy defence. Hadley reveals the military and political impact on Canada of in-shore submarine warfare and vibrantly documents the successful German strategy of deploying daring long-range solo sorties to pin down the enemy close to home.

Michael L. Hadley is an award-winning writer, scholar, yachtsman, retired naval officer, international traveller, and lecturer. He is the author and editor of several books on naval and maritime history, including Spindrift: A Canadian Book of the Sea (co-edited with Anita Hadley) and Citizen Sailors: Chronicles of Canada’s Naval Reserve, 1910–2010 (co-edited with Richard H. Gimlett), and his work has won such prestigious awards as the John Lyman Prize of the North American Society for Oceanic History and the Keith Matthews Award of the Canadian Nautical Research Society. He is a Professor Emeritus at the University of Victoria and a Fellow of the Royal Society of Canada.

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"Hadley's masterful saga of how Nazi U-boats invaded Canada's inland waters (to within 172 miles of Quebec City) brings World War II uncomfortably close to home ... and reminds us that we are even less immune to such problems in the future ... This book achieves its purpose both as a valuable compilation of original research and as a damn fine, salty tale of the sea." Peter C. Newman.