I've just finished reading Orlando Figes' Crimea: The Last Crusade, Allen Lane, 2010.
I don't know what your specific interests are, but whereas I think the other books recommended above are 'more military', this, quoting from one review:
"There are several important books on the war but Figes has taken a broader perspective, using Russian sources as well as British and French, and applying his deep knowledge of Russian history to provide new insights ..... "
Figes, a "Russian scholar". ..... history Professor at the University of London ..... "has written an illuminating history of the war and, in particular, its religious dimensions".