The theme of the tale is the childhood sin of disobedience. Tom Kitten is a young cat who lives with his mother, Mrs. Tabitha Twitchit, and sisters, Moppet and Mittens, in a house overrun with rats. Her children being an unruly bunch, Mrs. Twitchit puts Moppet and Mittens in a cupboard in order to keep them under control, but Tom Kitten escapes up the chimney. As he makes his way to the top of the house, he comes across a crack in the wall and, squeezing through it, finds himself under the attic's floorboards.