A/N: This is quite a long chapter, taking place over a couple of days. It's from an idea by Smiley Face Ace, so you can thank her for the idea.

I hope this makes sense, it was a fairly hard chapter to write actually.

On with the show!

Normal is Mrs Hudson

Bold is Sherlock

Italics is John

Monday

Mrs Hudson, can I borrow your phone? -SH

Why can't you just use yours?

I can't find mine. –SH

Oh no you don't, young man. John already got me with that one once.

Mine is the wrong sort of phone. –SH

For what? What do you want to use my phone for?

I want to use an app that my phone doesn't have. –SH

I still don't know what an app is.

I'll tell you what an app is if you let me use your phone. -SH

Will it help solve a case?

Maybe. Probably. –SH

Fancy that, my phone solving a case! Tell you what, you come down and get it. I'm baking at the moment so I can't come up.

Coming, Mrs Hudson. –SH

Wednesday 2:30pm

John, Sherlock's playing a new tune he composed and I'd like to record it using the app on my phone. Can you help me please?

Well done, you worked out what an app is!

Sherlock told me.

Sherlock told you?!

He wanted to use my phone, so he told me what an app is.

That's slightly suspicious…so what was it you asked?

I wanted to know how to record Sherlock playing the violin.

Well, go to the list of your apps, then select the one with a picture of a black speaker. It should have lines coming out of it. Once you're in that app, press the circular red button and it will start recording.

Okay, I'll do that then. Thank you!

You're welcome, Mrs Hudson. Now if you'll excuse me, I've got a client.

I mean patient. I've been hanging around Sherlock too much.

Wednesday 3:05pm

John, I did what you said, but I don't think it recorded anything. Instead, the speaker symbol up the top of the app blew up.

The funny thing was, there was an almighty bang at the same time. Made me jump right into the air, it did.

The speaker blew up? A picture of a speaker?

At the top of the screen, yes.

There isn't supposed to be a picture of a speaker at the top of the screen, Mrs Hudson. I have exactly the same app as you, and mine doesn't have one.

Well, it was probably a speaker, I couldn't tell properly because it's too small.

It was a small symbol, with lines coming out of it, yes?

Yes, a small roundish picture with lines going out in all directions. Then when I pressed the red button, the speaker broke into little pieces and flew away, as if it had blown up.

This picture…it couldn't have been a bomb that you thought was a speaker, could it?

Maybe. I hadn't thought of that.

And when you pressed a red button, you heard a bang outside?

Yes, a couple of streets away, it sounded like.

Oh no.

You don't mean…

Maybe.

Sherlock took my phone and turned it into a bomb?

Well, not a bomb technically. Just a device that sets off a bomb.

Maybe. We don't know for certain.

I'll talk to him about it when I get home, okay? Stay away from him until then.

And for goodness' sake, don't use any more apps in the meantime!

Okay, John.

6:15pm

That was very loud, John. Did you need to shout like that?

Yes, I did. He was being infuriating.

By the way, you can expect a visit from him sometime soon.

6:20pm

I'm very, very sorry, Mrs Hudson, for using your phone without your permission. –SH

That's all right Sherlock. I forgive you.

Thank you. –SH

Just one thing: did you play with any of my other apps?

Don't use the stopwatch. –SH

I shudder to think.

Can you come down and fix it?

Please?

Coming, Mrs Hudson. –SH