Ten-year-old Isabelle discovers that she is heir to Fortune's Farm, a wondrous place where the final remnants of magic grow. She dreams of escaping her home in Runny Cove where it never stops raining and where she is forced to work in the umbrella factory.

A letter arrives for Caroline, asking her to come help her uncle Aaron and cousin Lydia on their new farm for the summer. Although Caroline is reluctant to leave her family, she's eager to lend a hand. So when she suspects that a thief has been stealing much-needed food from the farm, Caroline helps keep watch to guard against the uninvited visitor. Then she makes an unexpected discovery--and learns that some things are not as simple as they seem....