The story describes a troublesome and chaotic monster that unexpectedly appears in a family's home, causing disarray by eating continuously and being loud at night. The monster is depicted with playful descriptors like noisy, grumpy, dirty, and sticky, which symbolize the frustration it brings to those living with it. Various attempts to rid the house of the monster, such as scaring, trapping, and even sending it to the moon, fail and only make it more mischievous. Ultimately, the family member trying to get rid of the monster realizes that perhaps the monster isn't so bad after all. This narrative playfully explores themes of tolerance, acceptance, and the idea that sometimes what initially seems disruptive can reveal unexpected, positive qualities.