Unexpected

What did he do?  What was the crime?

A fingerprint spotted will confirm at what time.

A lover, a rose, both dead at the scene.

A killer, a knife, that nobody's seen.

How can this be?  What is the clue?

What may be false, and what about you?

Where were you at the time of this deed?

All must be learned, all clues I must read.

I must find who has murdered their friend, their old flame?

What must be done if he's found to be sane?

If that's what is right, I must report it to you.

For you are the killer, you've killed my love too.