The biblical account of the fall of Adam can be summarized as follows:
1) God created Adam and Eve and placed them in the Garden of Eden, commanding them not to eat from the tree of knowledge of good and evil. Disobedience would result in death.
2) Satan in the form of a serpent tempted Eve to eat the forbidden fruit. She and Adam disobeyed God.
3) As a result of their sin, Adam and Eve's fellowship with God was broken. They became ashamed and afraid, and were expelled from the garden. God cursed the serpent and pronounced judgment on mankind.