Girl code chronicles; Zombie apocalypse

Jenna and Karen are sisters and the only ones left in the Kass family because their parents gotten eaten by a bunch of zombies.

  Karen. Seventeen. Silent, Clever, and holds a grunge against zombies.

  Jenna. Thirteen. Small and aspires to be her sister.

  What will happen when Karen's friends from Canada and they form an alliance.

  And what will happen between Karen and (the boy he turned down when she was fifteen) River Thomas Fields.