The Astral Marten

As Charles rents out his late brother's car, intriguing people from all walks and segments of society are led to Charles' car lot to rent the Astral Marten, including Lady Jamis, who "must drive that car." But, the car has a secret - it's on a mission to save the Earth from destruction, and it must record conversations of those who rent it, so it can return the information to its home dimension in time. The mystery unfolds with each person who rents the car, because of the conversations he or she has on the day of rental, some of which are very strange.