Twins Isabella and Henry Howard have spent the last few summers at Misenum, Italy, on the Bay of Naples with their parents Carol and David. Misenum is an archaeological site where their parents hope to discover a lost villa that belonged to Pliny the Elder, a Roman statesman and admiral who died during the eruption of Vesuvius in 79AD. The villa has never been located but Carol and David think they have found it. The twins make amazing discoveries of their own; ones that will change the course of the excavation. They think of themselves as “dirt detectives,” but this summer they also become real detectives when they uncover a nefarious plot to steal ancient Roman antiquities. With the help of trusted friends, Guido and Stefano, and their parents, they help the Italian Art Squad capture the crooks and recover the stolen art.