Alex gets taken to the doctor more often that Alex likes.

Dr White takes an awful lot of blood samples - so greedy is he for blood that he uses a double syringe and he sends great big bottles of if to the 'lab'.

This makes Alex suspicious - and sure enough, the blood 'samples' are not going to a lab at all, but to the blood bank.

Alex decides to investigate, and it turns out that the blood bank has been taken over by flocks of white-coated vampires!