Sophia Holmes and the Empty Hearse (Sherlock's Daughter Fanfic) *Completed*

I stand by the front door for a moment and sigh before pressing the doorbell. I've come to Mycroft's house to give him my leads so that we can shut down the underground network before dad can. It's not the best option, but it's preferable to going back home.

Mycroft's voice crackles on the intercom as the door clicks. "It's open." I push the door open and walk through the hallway to Mycroft's office, stopping in the open doorway. "Sophia, to what do I owe the pleasure?"

"I've got a lead," I say, lowering my bag to the floor and pulling out my laptop. "That agent of yours - he uncovered a plot to blow up the underground rail system."

Mycroft raises his eyes and meets mine. "How do you know?"

"Tube station caught footage of Sebastian Moran getting onto the last car at Westminster," I explain. "Except he wasn't on it when the train reached St James's Park because the entire car had been decoupled from the rest of the train. Somehow it's been diverted."

"And how is this relevant to our bomber?" Mycroft frowns.

"He's one of our markers," I reply. "Five people out of our six were acting perfectly normal, but he's the only one acting different. I have a feeling our bomb is somewhere on that last car."

"If what you're saying is true, then we have a larger problem," Mycroft says.

"How so?"

"Lord Moran has been working with North Korea since 1966, and before his death, was personally linked to James Moriarty."

My eyes widen. "That's not good. I need your private server - I need to look into the full extent of the tube system. Everyone knows it's not contained to what the public sees."

Mycroft raises an eyebrow. "Are your skills so very depleted that you must seek permission in order to access it?"

I roll my eyes. "I thought, as we were supposedly combining forces on this, that it was better to ask.

"It has nothing to do with the tiff you had with Sherlock, then?"

"No, it's not," I say, not even bothering to lie. Mycroft has always been able to read me like an open book. "You're right - I could set up anywhere and tap into your server, but it's a lot quicker if I come here and get some insight from you. Now are you going to talk about dad, or are we going to stop this bomb?"

Mycroft raises an eyebrow, but moves from his seat so I can access his computer. I take the seat and quickly tap in his username and password without hesitation, getting me into his desktop. I type in a quick search for the underground tube system and load the image of all the tube networks. I zoom in on the section between Westminster and St James's Park, and then look at the individual streets the line passes under. St Margaret's Street, Bridge Street, Sumatra Road, Parliament Street. I trace my finger across, then spot something as I reach the Palace of Westminster.

"What does that symbol mean?" I ask, pointing to a small black and white icon of a train. All of the others are in blue and white, making this one distinguishable.

Mycroft leans in over my shoulder and looks at it. "That's the station in Sumatra Road," he says. "It dissects the line and heads up to a platform that was built back in the 70s. Everything was built there - the platform, stairs, shops - but it was tied up in a legal dispute and had to be closed."

"Well it's right beneath Parliament," I smirk. "Hardly an advisable place for a set of underground tunnels!" I stop and consider the last few days. A bomb beneath Parliament, John being buried beneath a bonfire. "Oh my god."

"What?" Mycroft asks.

"What's the date?" I say, wanting to make sure I'm right.

"November the -" Mycroft cuts off as he realises. "There's an all-night sitting in the House of Lords tonight to discuss the new anti-terrorism bill."

"But Lord Moran won't be there," I reply. "Not on the fifth of November." I stand up and grab my back from off the floor. "Thanks Mycroft, I can handle this. Do me a favour and send bomb squad down after me, will you?"

"Naturally," Mycroft says. "I have every faith in you, Sophia." I smile and start making my way towards the door. "Oh, and Sophie," he says, calling me back and I turn back around. "Disable it before your father and I'll make you the country's youngest dame."

"I really don't need a lot of incentive, Mycroft," I reply with a grin, before turning and heading back out.