Brief Summary of Assassins Creed

Desmond Miles, a bartender, is kidnapped by the company Abstergo Industries for use as a test subject in the "Animus", a device that can stimulate the recall of ancestral memories. Abstergo intends to put Desmond in the device to recall the role of his ancestor, Altaïr Ibn-La'Ahad, a member of the Assassin Brotherhood in the year 1191 as part of the Third Crusade in the Holy Land. Desmond has trouble adjusting to the device, but eventually relives Altaïr's exploits over the next several days. The game then primarily takes Altaïr's point-of-view, with occasional swaps to Desmond, due to glitches in the Animus. Templars (in the modern day Templars work in Abstergo Industries) want to go back in time and find these powerful mechanisms called "Pieces of Eden" and the only way to find them is using Desmond to go back in time and live his ancestors life because Altaïr knows where they are. Desmond is trying to escape, but first must find out The Truth.

http://assassinscreed.wikia.com/wiki/Assassin's_Creed 

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