A revisiting of the Classics books. The ultimate book series includes the following titles:

1 The Boxcar Children 1924 as Box-Car Children; reissued 1942  2 Surprise Island 1949  3 The Yellow House Mystery 1953  4 Mystery Ranch 1958  5 Mike's Mystery 1960  6 Blue Bay Mystery 1961  7 The Woodshed Mystery 1962  8 The Lighthouse Mystery 1963  9 Mountain Top Mystery 1964  10 Schoolhouse Mystery 1965  11 Caboose Mystery 1966  12 Houseboat Mystery 1967  13 Snowbound Mystery 1968  14 Tree House Mystery 1969  15 Bicycle Mystery 1970  16 Mystery in the Sand 1971  17 Mystery Behind the Wall 1973  18 Bus Station Mystery 1974  19 Benny Uncovers a Mystery 1976 20 Sleuth and Solve Activity Book  21 The Deserted Library Mystery 1991  22 The Animal Shelter Mystery 1991  23 The Old Motel Mystery 1991  24 The Mystery of the Hidden Painting 1992  25 The Amusement Park Mystery 1992  26 The Mystery of the Mixed Up Zoo 1992  27 The Camp Out Mystery 1992  28 The Mystery Girl 1992  29 The Mystery Cruise 1992  30 The Disappearing Friend Mystery 1992  31 The Mystery of the Singing Ghost 1992  32 The Mystery in the Snow 1993  33 The Pizza Mystery 1993  34 The Mystery Horse 1993  35 The Mystery at the Dog Show 1993  36 The Castle Mystery 1993  37 The Mystery of the Lost Village 1993  38 The Mystery of the Purple Pool 1994 39 The Ghost Ship Mystery 1994  40 The Canoe Trip Mystery 1994  41 The Mystery of the Hidden Beach 1994  42 The Mystery of the Missing Cat 1994  43 The Mystery on Stage 1994  44 The Dinosaur Mystery 1995  45 The Mystery of the Stolen Music 1995  46 The Chocolate Sundae Mystery 1995  47 The Mystery of the Hot Air Balloon 1995  48 The Mystery Bookstore 1995  49 The Mystery of the Stolen Boxcar 1995  50 The Mystery in the Cave 1996