This book was reaaaaaallly hard to get a hold of. It's been out of print for years and years but as a big fan, honestly, it was worth it. Definitely recommend getting this as it ties in heavily into the Year One and even shows some of the scenes in that from a different angle. It's more for fan service but I enjoyed it.
You can read my indepth review of it here. Sorry if this is spammy but it'd be good to get feedback from people from this forum.
Batman Shaman Review
Cheers