Very silly at first and lots of fun – magic takes over from science!
There exists a group of talented / magical individuals (Venus, Cassandra of Greek mythology ...) whose job is to control the magical creatures of legend still around on our planet. This volume deals with their struggle against Surtur, Fenris, the Midgard Serpent and others. Without giving too much away, the Mythic lot suffer ups and downs.
A bunch of Secret Origin stories at the end tell us how all these “heroes” got involved with the Mythics.
Generally this is an interesting tale and well worth a look. It's well-illustrated on top of that.