The Penderwicks at Point Mouette: 06/21/19
The Penderwicks at Point Mouette by Jeanne Birdsall is the third in the Penderwicks series. This time, the Penderwicks are divided. Mr. Penderwick and Iantha are on their honeymoon. Rosalind is at the beach. The remaining Penderwick sisters are up in Maine with their aunt.
Primarily the plot is focused on the Maine contingency of the Penderwicks. Skye is now the acting OAP with Rosalind on her own trip. She has a list of instructions from the eldest but she quickly realizes she in over her head.
Meanwhile, there's a subplot about Jeffrey who comes to visit. He makes friends with the aunt's neighbor. They bond over music. By the end of the trip, it's blatantly clear that the world is a much smaller place than anyone suspected as Jeffrey and this neighbor are clearly related!
In terms of the road narrative spectrum, volume three is the tale of siblings going to a rural place along a blue highway. As this is realistic fiction, and even has a better sense of place in time than the previous two do, there's nothing metaphoric about this journey. The siblings are visiting family in rural Maine. They went by a Blue Highway. Even in Jeffrey's case, he ends up finding family in Maine along the same route.