Hi Karentje,
For recommendations on Romanov books, go to the Books section of the forums <http://hydrogen.pallasweb.com/cgi-bin/yabb/YaBB.cgi?board=Books>. Not only does it have a ton of books, but also feed back (both good and not so good) from people on the forum who have read them.
As for Lovell's book, well, I took it with a grain of salt. The whole 5th daughter thing was just too much for me to believe. For a great book on Anna Anderson, I'd recommend The Riddle of Anna Anderson by Peter Kurth. Although I'm not a believer in Anna Anderson, his book is not only well written but is compelling and convincing. It's the only book that really had me re-think my beliefs in her, and made me open my mind to the possibility. Since then, I've gone back to being a non-believer, but that doesn't diminish the quality of Mr. Kurth's work in my opinion.
Alexa