The Night Hawks : Dr Ruth Galloway Mysteries 13

The Night Hawks, a group of metal detectorists, are searching for buried treasure when they find a body on the beach in North Norfolk. At first Nelson thinks that the dead man might be an asylum seeker but 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.