The Barstone Killer Synopsis

Inspecter George and his partner in crime turn up to Barstone Manor after new eveidence has been found for a previous case. They hope that this new evidence will help them solve the mystery of the lady’s death. However, what they did not expect is to be solving two murder cases at the same time when several household members are mysteriously murdered in their own home.

What is this other case? Who is the murderer? And are the two cases linked?