This was my first book by Lynn Kerstan, and I liked her style. There is a lot to recommend this book: suspenseful story, exotic location (India), well researched and detailed info., flawed but likeable h/h, and especially, really, really great dialogue (Georgette Heyer comes to mind). "Heart of the Tiger" was very easy to read, very easy to keep turning the pages. The storyline was different enough to be intriguing, and the interaction between the h/h was simply very good and very funny.
While I liked this author's style and would definitely buy another of her books, this particular book did not appeal to me too much. I'm not a fan of the supranatural, and there is too much of that interwoven into the story (along with a lot of interweaving of Hindu religion) for me to have really enjoyed this book.
Recommended, with reservations.