As she turns twelve during the summer of 1953, Penny gains new insights into herself and her family while also learning a secret about her father's death.

"When thrift-store aficionado Julie discovers a series of antique paintings with hidden glowing images that are only visible in the dark, she uncovers a century-old romance and the haunting true story of the Radium Girls"--Provided by publisher.

In 1968, with the Vietnam War raging, thirteen-year-old Lyza inherits a project from her deceased grandfather, who had been using his knowledge of maps and the geography of Lyza's New Jersey hometown to locate the lost treasure of Captain Kidd.