In the 'not-so-distant' future of 2045 a zombie outbreak was caused by a mad scientist in Russia. Luckily he wasn't able to make them immortal so they would start to decay in 3-4 months.

Today it's December 3rd 2047. Most of the zombies are dead but there's still more than enough. You've been hiding in a bunker for the past 2 years with a load of long lasting food ever since you heard of the zombie experiment.

Most of the world went to Canada and Greenland for it's cold climate since the zombies couldn't survive there since they have no natural body heat. But on the radio you heard they were running low on supplies there, unlike you who has another 3 years of food, well more than enough to survive.

You decide to go out for a patrol to find more coal for your generator since all the gasoline went bad and some destroyed your bike. So on your way back from a nearby shelter to haggle for some coal you see someone unconscious on the ground. And she's hiding a secret.