Thanks to everyone that turned up.
The party, who were hired to kill vampires entered the realm and discovered that they were in a trap. The Vampire, Count McGuffin (check wiki if you don't know what that is) turned out to be the least of their problems. An extradimensional being was in the land conducting tests on the folk of Hamiltonia and they were the next subjects.
With the help of Dorothy, the wizard of Aus and other people they finally managed to extricate themselves from this devilish dialema and to return to their own realm.