Friendship is forever in the fourth book of Ann M. Martin's heartwarming series, Main Street. Spring has arrived in Camden Falls, and with it have come many joys and challenges. As Flora and Ruby near the first anniversary of their arrival in town, Flora prepares for a visit from her old best friend. She's excited, but her new best friend, Olivia, isn't. Olivia's afraid she won't measure up, and that Flora will regret ever coming to Camden Falls. It's a very big reunion set for a very big day: Camden Falls's 350th birthday celebration. Does one best friend truly have to be the best...or can they find a way to get along?