I once was lost

A/U 3rd year. Will things get better or worse for Harry and the rest of when a weird stranger from another country turns up on the door step of Privet Drive and flips Dumbledore's well made plans arse over tin cans? All he knows is it CAN NOT be any worse then living with the Durselys. Right? Non-Can, O/C, my odd sense of humor, and lotsa worldbuilding. Rated T for now for cussing.