leave his frankenstein monster portrayal behind and boris karloff show in this film that he can act and do a good job of it . he play a greek general trap on an island with others fight the plague . a young girl and thea ( ellen drew ) be think to be a vrykolaka and a harmful undead creature in greek folklore and by an old peasant woman ( helen thimig ) . it have similarity to many different legendary creature and but be generally equate with the vampire of the folklore of the neighbouring slavic country . while the two be very similar and blood drinking be only marginally associate with the vrykolakas . the tale be a mixture of folktale and virus and of medicine and miracle and of superstition and madness . karloff carry the film with marginal assistance from the others . worth a watch to see his act .