Start with high-confidence india & south asia travel books, then narrow by subgenre or adjacent topics.
City of Djinns
William Dalrymple
On the Grand Trunk Road
Steve Coll
Nine Lives
India
Diana L Eck
Patterns of India
Christine Chitnis
Video Night in Kathmandu
Pico Iyer
Way to the Labyrinth
Alain DaniƩlou, Marie-Claire Cournand
Hindoo Holiday
J. R. Ackerley
Meeting the Buddha
Molly Emma Aitken
Discovering Bhutan
JanetWard Schofield
On the Hippie Trail
Rick Steves
India - Culture Smart!
Culture Smart!, Becky Stephen
Lonely Planet Nepal 13 13th Ed.
Bradley Mayhew, Joe Bindloss
Lonely Planet Sri Lanka 16 16th Ed.
Bradley Mayhew, Joseph Richard Francis
Lonely Planet India 20 20th Ed.
Joe Bindloss, Margot Bigg
Transformed by India
Stephen P Huyler