Where is Mrs. Earle and Mr. Lawrence when Joe, Elvis, and Angela Rossi arrive at Mr. Lawrence's house?

Before they could get to the house, Pike sees Kerris and three other people in a tan van. Rossi is able to see Mrs. Earle and Mr. Lawrence. They follow the van but stay far behind so not to be seen by Kerris, The van drives to an area that has two radio towers and a maintenance shed. Mr. Lawrence and Mrs. Earle are led out of the car at gunpoint.