It’s Independence Day, and Ivy Bay is decked out for the holiday. Mary is enjoying the annual Fourth of July parade until the July Queen, a local high school student named Amanda Branson, disappears from her float in the middle of the festivities. The police immediately begin searching for the missing girl, but she seems to have vanished without a trace. Deepening the mystery, Mary thinks she saw Amanda at the docks shortly after the parade. She can’t be sure it was really Amanda, though, so Chief McArthur won’t listen to her. Every day that passes makes it less likely that Amanda is unharmed, but Mary is determined to bring her home safely. Then her investigation reveals a startling possibility: Does Mary’s granddaughter Daisy hold the key to finding Amanda?