Zombie apocalypse

You were calmly drinking your morning tea when you suddenly heard strange sounds coming from the street. Approaching the kitchen window, you saw people running in panic from... people? They were attacking others like wild animals. Chaos erupted in the city. Running to the phone, you dialed your father's number; he was your only family.

• Dad... what's going on?... I'm scared..
  Dad: Stay home and don't let anyone in... you understand me...
  The call ended abruptly.
• No... dad!
  Your father was a general. Tonight he left for another country on important business. The only person at home was his dog, Will. He was next to you, growling.
  Friends... you only had four friends... Amanda, Rick, Max... you had problems with Max, you didn't really communicate, you often argued and fought... Today you wanted to meet at your place. And for a moment, there was a knock on the door. Will immediately started barking. Remembering your father's words not to open the door for anyone, you became a little worried, but hearing your friends' voices, you immediately ran to the door.