Identity Crisis

Alone in an isolated cottage, a young housewife awaits the arrival of
her sister, Jo. Outside, as storms lash the country, Dr Johana Grey
struggles to reach the house, finding it deserted, and in darkness, when
she eventually arrives. With Mike Nash on leave, DS Miranova leads the
investigation, which is complicated by the husband of the missing woman
being unaccounted for. Is he responsible, or has she been abducted by
the sadistic serial killer nicknamed The Cremator?  Before Nash's
return, a security van disappears along with its two-man crew. Further
violent crimes are reported and, as the detectives try to make sense of
the confusion, it becomes apparent that nothing is as it seems and no
one is quite who they appear to be. This is the sixth title in the
intricately drawn series featuring Mike Nash and the Helmsdale police
force.