Help me

It all started when JoAnn heard a knock at the door. "Who is it?" she called in a singsong voice. No answer. "Hm..strange. Most people answer.." JoAnn whispers to herself. She opens the door. No ponys there. "Weird.." she muttered and walked outside. "Hello?" she called. She hears a rustling in the bushes by her house. "Just the animals.. Probably..." she said and walked inside. She made sure to lock the door. "Just in case" she told no pony in particular. She trotted over to feed her puppy, Mocha. Then she trots up to her room to sleep. She hears the knocking again halfway up the stairs. JoAnn ignores it and keeps on going. She peacefully falls asleep. As she sleeps, a tall unicorn with a pitch black cloak enters the house. "I'm so glad I found you... JoAnn.." he says quietly and trots up to her room, making sure not to alert anypony.