I have KD1, KD2, Undercover Curry, The Curry Book, Madhur Jaffrey's Indian Cookery, The New Tastes of India, Meera Teneja's Indian Regional Cookery, Cooking with Spices, E P Veerawsawmy's Indian Cookery, Saroj Hadley's Exotic Curries and Mridula Baljekar's All-Colour Indian Cookbook.
I can recommend KD1. I am sure there is much to be gleaned from the others as well.
** Phil.