A Pocketful of Rye

"Sing a song of sixpence, a pocketful of rye,
Four and twenty blackbirds baked in a pie.
When the pie was opened the birds began to sing.
Wasn't that a dainty dish to set before the king?

The king was in his counting house, counting out his money,
The queen was in the parlour eating bread and honey,
The maid was in the garden hanging out the clothes,
When there came a dickey bird and nipped off her nose."

A series of murder had taken place in Fortescue family, simulating the above-mentioned nursery rhyme.

Miss Marple will solve the case.