Mattie's Ghost

You are moving to a new house. This is an old mansion with a lot of hidden rooms. Luckily, you have a detailed plan of this house. The day after your arrival, you plan to explore the house. It's so dusty around that you cough and rub your eyes every minute. At one of those moments, you open your eyes and freeze: a translucent guy stands in front of you, he smiles and says: -I'm Matti, will you help me become human again?