Details: Arthur thinks that babysitting is the easiest job in the world until D.W. volunteers him to Tommy and Timmy Tibble. Prunella describes her sister's only time babysitting the them as an experience that still gives her nightmares. Arthur can't control the Tibble twins and thinks he loses them while playing hide-and-seek but scares them out of hiding and into a scared but manageable state.

Whether they're facing down the school bully, worrying about a new teacher or babysitting the Terrible Tibble Twins, Arthur, his little sister D.W., and their friends manage to solve their third-grade dilemmas with imagination, kindness and a lot of humour.