The subject of underground warfare below the trenches of WWI received very little coverage at the time or during the decades afterwards. That has changed for the better during the Centenary commemorations. During the last two years a number of fine books have appeared on the subject, somewhat short of full coverage of this terrifying warfare, but a major improvement. Gratifyingly, each of these books has taken a different perspective, or covered uniquely one area of the subject. This new book provides yet another perspective and does so with warmth, affection, sensitivity and completeness. The author has done a very good job on the platform of through research. Essential reading for all WWI buffs but will appeal to a wider readership.