Agatha Christie They Do It With Mirrors

Miss Marple is told that her old friend, Carrie, is in danger and she goes to stay with her at Stoneygates, a home for maladjusted adolescents. While she is there, tragedy strikes as Carrie's step son, Christian Gulbrandsen, is shot dead. There are at least seven suspects and two more murders follow. But the man with the obvious motive has a cast iron alibi, as he could hardly be two places at once or could he June Whitfield once again stars as the indomitable amateur detective.