“Mandrake” (*1/2 out of four) was a torpid horror thriller about a probation officer (Deirdre Mullins) who is assigned to supervise and rehabilitate a notorious female killer (Derbhle Crotty) but finds that this affects her own mental health and sanity as she becomes subject to violent hallucinations and visions of a disturbing Hell that turns her life upside down. Moody film holds your interest for a little while but soon bogs down as it becomes alternately tedious and disgusting in equal measure. Viewers who make it to the end of this may need to seek out their own mental health treatment.