From the back cover:
"The League confronts a threat from space, but a much different menace from those they have faced before.
"This new danger arrives on our planet in the form of an alien disease - a cellular composition unlike anything on Earth, deadly to all who come in contact with it.
"The virus spreads quickly, setting off a chain reaction of global fear and panic.
"Soon the Justice League are under suspicion - are they ultimately responsible for this alien danger?
"Before long, paranoia, distrust, and an ensuing wave of hysteria threaten to rip the world apart.
"JLA: Justice and Liberty is not merely the story of one hero, but an epic tale of DC's most famous, colorful, and iconic characters, the first and greatest team in the history of comics - The Justice League of America."