Description of Attack at the Arena by Paul McCusker
Patrick and Beth learn that Mr. Whittaker's fancy ring can be seen inside the Imagination Station but not outside of the machine. A mysterious letter leads the cousins to fifth-century Rome in search of a special cup that belongs to a monk. If found, the cup could keep the mysterious Albert out of prison. At the Roman Colosseum, Emperor Honorius is hosting a gladiator battle in celebration of a war victory. Beth attends the event as the emperor's slave; Patrick attends as a monk's apprentice but is taken prisoner and sent to fight in the arena. During their adventure, the cousins meet Telemachus (a true historical figure), a monk who believes that fighting is wrong. Telemachus is willing to risk everything-even his life-to stop the killing. When the cousins return with the cup, they find that a third letter has been sent with more information about Albert's fate.