Leave the Grave Green

When the body of Connor Swann - relation of the well-known operatic conductor and celebrated soprano Dame Caroline Stowe - is found floating in a Thames river lock, Superintendent Duncan Kincaid and Sergeant Gemma James are quickly summoned from Scotland Yard.

But this is not the first murder to strike the family. Twenty years ago Dame Caroline Stowe's young son Matthew, also a musical genius, died from drowning. Could the seeds of the murder have been planted all those years ago?