Sam wants to go out but it's pouring with rain, so he and Grandpa decide to stay inside until the rain stops. Sam drinks hot chocolate and reads his books and dreams of adventures while Grandpa gets on with his important paperwork. Grandpa seems to have a VERY important letter to write.
An errand forces Sam and his grandfather to go out into the rain and floods, with a magical adventure following in this addition to the weather-based quartet that started with "Snow".
