As the name of the book would suggest, it covers the battle for the Island of Blood between the High Elves and Skaven. You will have a pretty good idea of what types of warrriors will be involved if you know the contents of the box set (but there are others that come along).
You get to see the motivation for the Skaven attacking the island and the plight of the elves defending it. As should be expected in any Skaven material, expect some betrayal and deceit from the furry little creatures.
Here is the extremely quick (the book is only 100 pages, after all) plot synopsis. It’s pretty similar to the Island of Blood battle report in one of the White Dwarf magazines. The Skaven invade the island and surprise the elves, pushing them back to the temple where the Phoenix Stone lies. The elves have serious trouble holding off the Skaven, and only a desperate attempt by the resident mage to utilize the power of the Stone helps the elves survive long enough for Tyrion and his elves to show up and save the day.
While I didn’t enjoy this book quite as much as the previous Warhammer books that I have read, it was still interesting and didn’t take me long to finish. I would recommend it to any High Elf, or even Skaven fan.