Reign of Madness by Lynn Cullen

Currently I am reading Reign of Madness by Lynn Cullen.  It's about Katherine of Aragon's sister Juana of Castile.  I am half way through this book, and it's been very hard to put it down.  It's gripping right from the start, especially if you are interested in this period of history.  I personally love the Tudor era of history, so this was a very good choice of book for me.     I hope that it will continue being as gripping in the second half.  I'll let you know, when I am finishing reading.

http://www.amazon.com/Reign-Madness-Lynn-Cullen/dp/0399157093/ref=ntt_at_ep_dpt_1