Enchanted August by Brenda Bowen

Lottie and Rose are two moms with young children, and are feeling overwhelmed with their lives. When they spot a notice on the school bulletin board advertising a cottage for rent in Maine for the month of August, they jump at the chance to get away and relax without their families. Hopewell Cottage turns out not to be a small cottage, but a very large home on Little Lost Island, with many bedrooms and a lot of charm. Lottie and Rose have gotten two other people to rent the cottage with them for the month--actress Caroline Dester and seventy-ish Beverly Fisher. None of the four know each other before they head off for their month away, but soon they are sharing meals and confidences. Enchanted August is a humorous tale of friendship and how the magic of a new place might just change one's life for the better.