Gamma Butyrolactone (GBL), closely related to
   GHB, is increasingly the drug of choice for
   London's narcotic connoisseurs. It produces
   a short, intense rush, heightens sexual
   pleasure and is metabolised very quickly -
   so almost impossible for, say, police to detect.

   GBL does have one major side-effect. It induces
   a deep, unrousable sleep which can come on
   quite unexpectedly. Like, perhaps, when you're
   a super-famous pop star driving home from a
   night's cruising and the traffic lights in
   front suddenly turn green...