“Wouldn't it be better just to go home, dear?"
-- Aunt Petunia
"Daddy's gone mad, hasn't he?"
-- Dudley Dursley
Uncle Vernon drives all over the countryside, trying to get away from whomever is watching them.
Exactly what he was looking for, none of them knew. He drove them into the middle of a forest, got out, looked around, shook his head, got back in the car, and off they went again. The same thing happened in the middle of a plowed field, halfway across a suspension bridge, and at the top of a multilevel parking garage.
“Daddy’s gone mad, hasn’t he?” Dudley asked Aunt Petunia dully late that afternoon. Uncle Vernon had parked at the coast, locked them all inside the car, and disappeared. (PS3)