The Roman Holiday (Thea Stilton #34)

"The Thea Sisters are heading to Rome! They were chosen to be part of an international archaeology competition. The mouselets have to follow clues through Rome to solve puzzles and win the golden cup. But as they explore the beautiful city, the sisters get the sense they are being followed, and worse, someone is going through a lot of trouble to slow them down. can the mouselets figure out who is trying to sabotage their chance at the prize before it's too late?"--Back cover.