Reminds me of 'The Honour of Israel Gow.'

Huh?

It's a mystery story from the outside world.

An earl passes away, and the police start finding lots of loose objects around his castle.

Like candles without candlesticks.

Or little springs and cogs.

And a prayer book with pages torn out of it.

When they inspect the earl's grave, they discover his head is missing, too.

The mysteries keep coming, but eventually the brilliant Father Brown finds the common thread tying them together.

Maybe it's like that here. Everything that's missing all links together somehow.

Find that, and maybe you'll find the clue you need to lead you to the victim.

Oh, whoops...

Sorry, I really shouldn't be helping you with this any more.

No, this is great. Thank you, Aya-senpai!

So...how does the story end?

Go read it for yourself.