okay this is a story of two separated sisters Scarlet and Violet they are both Half zombie so The Special Infected zombies are like Family Scarlet has her adventures with Zoey,Francis,Louis when Violet is with Nick,Ellis,Rochelle and Coach but then some encounters of they're family they found each other when the Two groups meet (Okay this basically in the L4D/L4D2 universe and I stay up all night thinking about this curve I'm imaginative so dont blame me if this is weird and the story starts with Violet)