Build the atmosphere, make them wonder what hides in the shadow, make them go crazy as they start thinking about toxic-insect-shedim-inhabiting-cyberzombies, and don't throw anything for them. Not a thing. That spooky house is just a spooky house with nothing weird nor strange inside.

Don't go for the small baddies like shedims, insect spirit, or cyberzombies. Go for the real dark beast, for the father of all bogeyman, for the worst thing on earth : man himself. Either show them some really wicked (meta)human (if you want some examples, just look at the news) or, even better, make them confront their own dark side.

During a dark and foggy night, have them driving through the area to get to somewhere else. Then when they get to a small town, the van breaks down outside a gas station when they need to refuel (how conviniant). The Mechanic says he can get the required part (the team rigger doesnt have it, Railroading!) but it's going to take until tomorrow to make.
While they explore the town to get to an inn or something, they see a couple of humanoids in black robes with hoods hurrying across the street infront of them. They cant make out any features due to the fog and them being too far out, other than the color and style of cloths.

The rest of the walk is uneventfull and they reach an Inn before 2200hrs. The in is an old fasioned one with a sign-in book and desk clerk. The desk clerk is a 20 something female elf who smiles and is happy to see the group, no matter what they look like. She makes some pleasnt conversation to try and make friends with the group while they sign in.
She gives them their room keys (each person has their own 50:nuyen:) and also shows them too the dining area where they have a good 'real' meal served by a wirey male ork who likes to yell 'Bam' alot.

Once 0200 rolls around, no matter who is asleep or awake, they hear a scream from downstairs. (perception 1, -4 if asleep) If any of them are awake and get down there right away, they see 3 black robed figures hauling the elf out the front door and into a black van. There is no comm traffic except for the elf girl's (signal 4).
They can follow the tire tracks with a shadowing 2 test due to the wierd mud droppings that go to the east and edge of town. It takes the group an hour of tracking to enter the woods and then they need a Survival 2 test or Shadowing 3 to continue the tracking.
After another 30 minutes of tracking the robed figures, any hackers can pick up on the elf girl's comm if they have a signal 4 or greater. at 45 mintues, they can pick it up at 3 signal. A sucessfull scan 3 test will give the team greater pinpointing of the girl and in 30 minutes, they see a light in the woods and hear chanting. Without the scan test, the group needs to make a shadowing 3 or survival 2 test again. If any of these tests are failed or glitched, the group spends around 10 minutes searching again due to messing up the trail in their failed search. If a critical glitch happens on any track tests, they wander into poison ivy or some other annoying wilderness thing.

In the clearing they can see a mass of black robed people around a bonfire chanting, while a red robed figure leads them on a podium with the elf girl on it. She is still unconsious, but they can see she is unharmed really. A perception test 4 shows that she wasnt the only non-robed person there as the group sees bloody knives and a pot of red liquid in front of the podium.
The chanting then stops as the red robed figure pulls out a fresh knife. If the group fails fails to shoot the leader, the girl dies due to sacrafice. If they do kill the leader, the girl is saves.
Either way, the blood explodes out of the cauldron and a blood elemental forms in the open. The robed figures dance for joy with either outcome, up until the elemental starts slaughtering everything in the field. It will eventually kill everything out there, including the elf girl if she survived the knife, unless the group does anything.

The Blood elemental is a R7 free elemental and cant be banished. It only has immunity to attacks without an element or magic to it. (IE, shock rounds, ex rounds, magic, adept killing hands all work normally) The elemtal has armor 14 and body 14 for damage reduction and 15 physical damage. Treat it as a no casting elemental, with only melee attacks.
If they save the elf girl, they get 3 extra karma and the mayor passes them a 25000 certified chip as thanks, but wont recognise them for anything. They also gain 1 street cred bonus.
If they fail to save the girl and run away from the blood elemental, the group gets 1 notoriety for being seen running out of the woods, and then the elemental coming out later.
At noon, the mechanic contacts the owner of the van saying its ready. The group can stay or leave, but nothing else happens in the town.

If you're playing in Seattle, and you want something just a bit trite. Isn't there a gang of "Fast Zombies" lurking offan abandoned highway? Have a car breakdown there eh?