Outdoor Girls in a Motor Car

In "The Outdoor Girls in a Motor Car, Or The Haunted Mansion of Shadow Valley", one of the girls has learned to run a big motor car and she invites the club to go on a tour to visit some distant relatives. On the way they stop at a deserted mansion and make a surprising discovery. This is the third book in the "Outdoor Girls" series. (Summary from an old book advertisement) Laura Lee Hope is a pseudonym used by the Stratemeyer Syndicate for several series of children's and young adult novels.