"Mm. ...How confident are you that you actually can get out of here without being spotted?"
"Highly. Stealth is a longstanding hobby of mine. I believe the relevant quotation is, 'I followed you.' 'I saw nothing.' 'That is what you may expect to see when I follow you.'"
"I was trying to find something to pick the lock and didn't come up with anything, and breaking shit is loud - out here in what sounds like the middle of nowhere even forcing a painted-shut window might be loud."
"I can get out of this house without making loud noises or being more than minimally visible. If they are watching all the exits, very closely, then they'll see me. I don't think they're watching all the exits very closely, because that takes a significant resource investment."
"I suppose once you have an exit traversable we can always fall back on 'confront the asshole' if it turns out you do make a sound. So you get out, if you can find a payphone you try 911 and if that doesn't work you find a quarter and call my dad -" She provides the number. "And tell him where I am. If you can't find a payphone find my house -" It has an address, fancy that - "don't go too near the porch, I think he's home tonight but if he's not 911 will work better anyway."
"Understood. Suggested approaches for 911 and the house visit? Particularly, if your father wouldn't believe I am an innocent vampire coming in peace to alert him to his daughter's state of peril, what will he believe?"
"Tell the dispatcher that you... found me, which is almost true anyway, and read my school ID. Isabella Marie Swan. When you talk to Charlie, whichever way you wind up doing it, tell him - I don't know, um - tell him that you are a friendly shenanigan and I need a ride away from an unfriendly shenanigan. If he calls bullshit you can be all movie villain 'very well. But regardless, your daughter is at thus and such an address' wherever it turns out we in fact are, and then he has to check it out anyway. Do not make any attempt to be invited into the house, give him a berth on his way out to the car."
(A quick circuit of the ground floor to map all the most obvious exits and decide where he would be watching if he were imperfectly watching this house; then he picks a back window that is not visible from any likely vantage, and carefully coaxes it open. Out he goes, without making a sound.)
Now: payphones, or Bella's house? Which shall he find first?
Without getting within porch-light-activating distance of the front door, he comes close enough to listen—is anyone home?
"What do you want at this hour?"
"Message from Bella Swan. She describes me as a 'friendly shenanigan' and requests a ride away from an unfriendly shenanigan at," he gives the location of the abandoned house.
"Reasonably ordinary humans with an inscrutable agenda kidnapped her, drugged her, and locked her in an abandoned house. It seems there was meant to be a danger present for her to either cleverly overcome or die of, but that part didn't work out as planned, so she is not in immediate peril and managed to send me out to summon a rescue."
Charlie gets his gun and peers out the front window to detect a lack of Sherlocks there and goes and gets in his car and drives. Lights, no siren.
Sherlock makes himself comfortable in a handy shadow and awaits developments. It's not like he's going to get ahead of the cop car if he tries. Maybe if he'd had a little longer to get to know the town.
The cop car is back, with Bella in it, twenty-five minutes later.
"Friendliest shenanigan?" calls Bella. "You there?"