"I am Andrew Ryan, and I am here to ask you a question..."

"Is a man not entitled to the sweat on his brow?"

"'No,' says the man in Washington, 'it belongs to the poor.'"

"'No,' says the man in the Vatican, 'it belongs to God.'"

"'No,' says the man in Moscow, 'it belongs to everyone."

"I rejected those ideals...I chose something different......I chose the impossible. I chose... Rapture. A city where the artist would not fear the censor. Where the scientist would not be bound by petty morality. Where the great would not be constrained by the small. And with the sweat of your brow, Rapture can become your city as well."
―Andrew Ryan

The time is early September 1958. Rapture is within its prime, the plasmid business is in full swing, and the newly comissioned Big Daddies that were created to escort the Little Sisters through the city's corridors keep them safe while they gather ADAM, the genetic material that makes up most of Rapture. However there are rumors and civil unrest happening in the streets and that riots and wars could happen soon if the unrest continues. Andrew Ryan continues to hold his iron firsted ideology all over the city, while Frank Fontaine is making a name for himself in plasmamid business, but rumors go of that Fontaine is planning something bigger that could bring Rapture under his control. So what about the citizens caught up in all the unrest, what do they do? Do they follow Ryan and his ideals, or do they follow Fontaine and face the almost certainty that they'll be hanged by a hook in Ryan's private art collection. Humans, Splicers, Big Daddies, Little Sisters all make up Rapture, the idea is for what do you choose to do, and what the outcomes will be

The actual story starts that of one Adrian Turner arriving in Rapture, searching for his family gone missing, specifically his mother and sisters. However since he is one man alone in the underwater city he can't hope to do this alone in finding them. Will the citizens of Rapture help or hinder Turner in his search, and what will come out of it with the threat of civil war almost booming to leak through.

What you can play as in the world of Rapture:
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Humans: Simple enough, might indulge in the addicting properties of ADAM to give themselves plasmid powers to protect themselves or carry around a pistol or machine gun for protection as well.

Splicers: Splicers were normal citizens of Rapture, before they got spliced up on ADAM. Now to them ADAM is all that matters and they will do anything for their next fix, such as killer hits on other people or doing dirty work in general as long as they satisfy their addiction. Splicers usually are themselves with whatever they can find such as wrenches, pipes, pistols, grenades, and hooks.

The Big Daddies
Bouncers: Bouncers are big hulking Big Daddies with an almost ball shape in their bodily appearence, they are equipped with a drill which they use to disembowel the innards of anything that dares harm their Little Sisters. They can also pound the ground with the drill to throw others off balance and they have a nasty charge ram attack as well. Bouncers are very vulnerable to electric attacks and ammo.

Rosies: Rosies are more of a long distance attacking Big Daddy then the Bouncers, they are armed with rivet guns that can go right through a human's body. Rosies also use grenades on foes that hide behind cover. Unlike Bouncers electrical attacks and ammos do not stun them as much.

Rumblers*: Due to the ineffectiveness of Rosie and especially Bouncer Big Daddies due to increased Splicer attacks on Little Sisters, the Rumblers were comissioned for more heavier firepower, Rumblers utilize a rocket launcher and throw out mini turrets to take out their foes.
Alphas: The Alpha Series Big Daddies are considered the first Big Daddies to be created. They utilize both a drill and a rivet gun, however one defect exists within their conditioning. Whenever an Alpha loses a Little Sister, they will go into a coma and eventually die.

The Sisters
Little Sisters: Little Sisters are the somwhat creepy glowing yellow eyed girls wandering around Rapture's halls. Their main purpose is to collect ADAM from the corpses(Angels) that often found just lying in the streets. Whenever they extract ADAM they become an easy target for Splicers which Big Daddies are needed to protect them.
Big Sisters*: Rumors have been going on that another program is being conducted on girls when they grow older. However it wouldn't be pleasant to encounter one as that big needle doesn't look nice nor the fact they may have the ability to use plasmids.

*: I know Rumblers and Big Sister didn't exist til after BioShock, but I decided to put them in for people if they wanted to use them

For anything you need to know of Rapture, or BioShock in general go to this link
http://bioshock.wikia.com/wiki/BioShock_Wiki