Emili Rossell, the young owner of one of Barcelona's top galleries, receives an old manuscript written by an Italian architect about the "Invisible City"—an ambitious project dreamed up by King Charles III to build an alternative capital city in the Ebro delta. The manuscript contains hints about a lost masterpiece by the Venetian painter Tiepolo, and the site of the Invisible City is where Emili used to play as a child. Juxtaposing the life of the 18th-century royal court and the contemporary art world—both with a similar share of intrigue, politics, and romance—this is a gripping historical mystery and a compelling examination of the forces of power and love.