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Bradfield is in panic, as someone is preying on the most vulnerable of hospital patients. Carol must juggle how to warn the public, while trying to keep a predatory MI-5 official at bay. The only way out is to solve the case fast - but there is very little to go on, even for Dr. Tony Hill.
This episode was first aired in Israel on January 11, 2004.
In the United Kingdom, this episode drew in 6. million viewers and was the highest rated show in its time slot.