Set in 17th century Paris, musketeers Athos, Porthos, Aramis and D'Artagnan are members of an elite band of soldiers who fight for what is just. They are heroes in the truest and most abiding sense – men that can be trusted and believed in to do the right thing, regardless of personal risk.

When Mr. Whicher, a retired policeman, helps a country lady to find her niece, he is drawn into a disturbing case of murder which brings him up against wealthy and powerful figures and throws him into conflict with his former police colleagues.