The boxcar children．31，The mystery of the Singing Ghost The Boxcar Children．31，The mystery of the singing ghost / The boxcar children．40，The mystery of the missing cat The boxcar children．39，The mystery of the hidden beach The Boxcar Children．98，The mystery of the runaway ghost / The Boxcar Children．42，The mystery of the missing cat / The boxcar children．36，The mystery of the purple pool The boxcar children．26，The mystery of the mixed-up zoo The boxcar children．35，The mystery of the Lost Village The Boxcar Children．81，The mystery of the midnight dog /