When Betsy's Dad's new birdbath decoration turns up missing, everyone suspects their dog, Gracie. But using their five senses, Betsy, Billy and Molly solve the mystery and discover the true culprit. Everybody learns that guessing isn't as good as the facts and that you are innocent until proven guilty. Betsy is worried that no one will be able to come to her birthday party because they all have things to do this week. She isn't sure exactly how everyone's schedule will impact her party, but, fortunately for Betsy, Mrs. O'Connor teaches her all about calendars. She learns how to measure time with a calendar and the proper order of the days of the week.