I'm currently reading Susanna E Lewis' Knitting Lace: A Workshop with Patterns and Projects
thanks to my wonderful SO tracking down the new edition.
I'd recommend this to any knitter with an interest in lace. Lewis deconstructs the patterns from a victorian lace sampler providing patterns for almost 100 designs. But to me more importantly she talks about the construction and design of lace patterns, invaluable if you want to chart your own ideas or use a lace design from one pattern in another garment.
I'm enjoying it so much I've already bought a graph paper book to chart ideas.