This ground-breaking work is now available as a high-quality hardbacked book, enhanced with free videos that highlight in-stream evidence, experiments, and innovative fly tying techniques. The authors spent years filming trout interactions with natural and artificial flies, using advanced cameras to capture remarkable behaviours that shape fly design and presentation. They share simple, effective fly patterns that mimic the vulnerable insects that trout prefer. Peter and Don offer expert guidance on locating feeding fish, approaching them, and presenting flies to minimize rejections. With 100 new patterns and fresh insights into trout behaviour, this book is an essential resource for anglers and fly tiers. Colour photos throughout, QR codes for links to videos; 4to (189 x 246mm), 400 pgs.