Overdose. Helen Shepherd Mysteries, #2

When Caroline Murray is found dead in an underground parking garage with a needle in her arm, the case seems clear. Caroline died of a drug overdose. However, everybody who knew Caroline insists that she was vehemently opposed to drugs and would never have taken any. And what was Caroline doing at 544 Grant Road, a building to which she had no known connection? Detective Inspector Helen Shepherd is quickly convinced that Caroline Murray's death was not a simple drug overdose.
But who had reason to want Caroline dead and why? This is a crime novelette of 7700 words or approx. 24 print pages altogether in the Helen Shepherd Mysteries series, but may be read as a standalone.