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 in two places at once - or could he?

June Whitfield once again stars as the indomitable amateur detective.