In the latest installment of Camille Minichino's fun, fast-paced Periodic Table mystery series, retired physicist Gloria Lamerino and her fiancé, homicide detective Matt Gennaro, attend the wedding of Gloria's best friend in California. Unfortunately, the groom has disappeared along with some top-secret research on nitrogen. As Gloria and Matt try to figure out a connection between the missing groom and the absent classified nitrogen research, the body count rises.