It's Stein's birthday - his three hundred and eleventy somethingth birthday. He's never had a good one yet, but then his parents, ancient chemists Lavina and Darius Penhaligan, give him his greatest ever present. Stein makes a new friend, the bumbling Frank. But what about his old mates like Viggo the Vampire and Zeds the Zombie? And what's going to happen when the villagers find out just what's going on in the castle on top of the mountain? It's going to take some undead adventures and the use of both boys' unusual brains to find out. From the best-selling author of the Jane Blonde spy series.