Marta Alvarez is the director of Palazzo Vecchio in Florence. She allowed Robert Langdon accompanied by Ignazio Busoni in the museum after hours, though the reputation of either of them would have sufficed. The next day, she uncovered the mistery of the disappearance of Dante Alighieri's mask by deciding to check the cameras and seeing Langdon taking it from its place. However, she let Langdon and Sienna Brooks go before the police arrived after he promised to return it safely to the palace.
At the end of Inferno, Marta had her first child, a baby girl who she called Catalina.