Each book of Paradise Lost is prefaced with an argument, or summary. These arguments were written by Milton and added because early readers had requested some sort of guide to the poem. Several of the books also begin with a prologue. The prologue to Book I states Milton's purpose: to tell about the fall of man and justify God's ways to man.
The epic begins traditionally in medias res. Satan and the other rebellious angels awake to find themselves in Hell on a lake of fire. Satan is lying beside Beelzebub. Satan raises himself from the lake and flies to the shore. He calls for the other angels to do the same, and they assemble by the lake. Satan tells them that all is not lost and tries to inspire his followers. Led by Mammon and Mulciber, the fallen angels build their capital and palace, Pandemonium. The highest ranking of the angels then assemble for a council.
In the council, Satan asks what the demons think should be the next move against God. Moloch argues for open warfare. Belial twists Moloch's arguments, proposing that nothing should be done. Mammon, the materialistic angel, argues that they do the best with what they have. Finally, Beelzebub, Satan's second in command, proposes that the angels try to get at God through his new creation, Man. Beelzebub's proposal, which is really Satan's proposal, is adopted, and Satan volunteers to find the new world and new creatures. He leaves at once, flying to the Gate of Hell. There, he meets his children, Sin and Death. Sin opens the gate for Satan who flies out into Chaos and Night. Sin and Death follow him. Finally, in the distance Satan sees Earth.
