It's 1949 Los Angeles, the city is run by gangsters and a malicious mobster, Mickey Cohen. Determined to end the corruption, John O'Mara assembles a team of cops, ready to take down the ruthless leader and restore peace to the city.
A shy student trying to reach his family in Ohio, a gun-toting tough guy trying to find the last Twinkie, and a pair of sisters trying to get to an amusement park join forces to travel across a zombie-filled America.
Centers on Deputy U.S. Marshal Dan Shaker who, when members of the Federal Witness Security Program start getting killed, leads the hunt for the person who stole the list, a file with the identities of every member of the program.