The Case of the Thorn MansionBook - 1997
Spooky Thorn Mansion is deserted--and full of mysteries for Mary-Kate and Ashley, the Trenchcoat Twins, to solve. There's an eerie humming noise, puddles of mysterious goo on the floor, and a strange thick fog emitting from the old house. photo insert.
Publisher: [New York] : Scholastic, c1997.
Characteristics: 76 pages,  pages of plates :,illustrations ;,20 cm.