The Counterfeit Man

I should warn you that there are going to be spoilers in this review.

The Counterfeit Man
by AlanNourse
Adapted by Philip Broadley

Returning to Earth after a disappointing expedition to Ganymede, Dr Crawford, the ship’s medical officer, is shocked when a routine check-up reveals crewmanWescott cannot possibly be human. When a second test comes back normal, the doctor is convincedthat they have an alien intruder which can copy humans down to a molecular level. With the reluctant help of Captai...