This book contains a big variety of paintings and painters through a period of time, all focusing the themes of biblical images and ancient Greek-Roman mythology. You'll see an image of the complete painting and then details of it, combined with the story it depictures and what lays in the details. 
The one thing I found a bit sad is that the explainations stay superficial (I would have prefered a dept-analysis but perhapse I need to read another type of book for that..). But the advantage this way, is that there a lot more paitings that can be discussed.