Quite good.

13th book in the very popular Ruth Galloway series by Elly Griffiths. 

Ruth is a forensic archaeologist who assists the police from time to time with investigations. 

The Night Hawks, a group of metal detectorists, are searching for buried treasure when they find a body on the beach in North Norfolk.

… he turns out to be a local boy, Jem Taylor, recently released from prison.

Ruth is more interested in the treasure, a hoard of Bronze Age weapons.

Nelson at first thinks that Taylor’s death is accidental drowning, but a second death suggests murder.

Nelson is called to an apparent murder-suicide of a couple at the isolated Black Dog Farm. Local legend talks of the Black Shuck, a spectral hound that appears to people before they die. …