Two young lovers out for a night of romance. A short cut through a cemetery. They witness a murder, but there has been no struggle, only a knife to the heart.

It has all the hallmarks of an assassination, but who is the woman?

And why was she alongside a grave at night? Did she know the person who killed her?

Soon after, other deaths, seemingly unconnected, but tied to the family of one of the young lovers.

It’s a case for Detective Chief Inspector Cook and his team, and they’re baffled on this one.