Goosebumps.
Stine, R. L.
Stine, R. L.Blob that ate everyone.
Stine, R. L.Curse of Camp Cold Lake.
Stine, R. L.My best friend is invisible.
Stine, R. L.Deep trouble II.
London : Scholastic,
2000, c1997.
The blob that ate everyone -- Curse of Camp Cold Lake -- My best friend is invisible -- Deep trouble II.