Zombie Mastery

Location 1: Commonlands

Enter the Commonlands, and head to the Falling Gate.

Falling Gates Loc = 1,500, x, -400

Qeynos Players, you must have a key to enter Fallen Gate. Group with a Freeport citizen who has the key, or sneak into Freeport through the sewers to search for the Quest NPC named Kanos X'Aphon to get your own key.

Location 2: Fallen Gate

You will now need to head to Market 2, and may need a group for this depending on your level.

Go forward through the dungeon and you will soon come to a small area that looks like a burnt down town. This area seems to be referred to by players as "Market 1". Run forward into this town, and the path will take a U shape, and you'll continue down a narrow path to a small lake.

From this lake, run forward, following the left wall. You will soon come up a steep ramp and discover another town:

From here continue forward into the center of the town, and then turn to your left to where you will see a row of tents:

From here just head down to the end of the tents. You will find the zombie book in a large urn between two tents.

The lowest reported level player to have picked up the book is 20.  I myself got it at 24.