Agatha Christie was Brilliant at using Nursery Rhymes in her stories.

A Pocket Full of Rye is good.

Four and Twenty Blackbirds too.

Sing a song of sixpence,
A pocket full 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 the counting-house
Counting out his money,
The queen was in the parlor
Eating bread and honey,

The maid was in the garden
Hanging out the clothes.
Along came a blackbird
And snipped off her nose.

Sing a song of sixpence,
A pocket full 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?

Titus Andronicus or Sweeney Todd ?

Or maybe Agatha Raisin via M c Beaton – Blood of an Englishman

WTF? More cannibals?