10 of those

All aboard for fun, adventure, and faith! Join Beth and Patrick as they're whisked through time to complete vital missions.

Includes the 3 books:

#1: Voyage with the Vikings: Join cousins Beth and Patrick as they travel back in time to Greenland circa 1000 to find a Viking sunstone! While visiting Whit's Soda Shoppe, the cousins find a mysterious, old letter in Imagination Station asking for Viking sunstone; if the sunstone isn't found then someone named Albert will be imprisoned. Beth and Patrick race through time, meet the Vikings Erik the Red and Leif Eriksson, and locate the sunstone. But when they return to the Soda Shoppe another note is waiting for them requesting a silver goblet.

#2: Attack at the Arena: Join cousins Beth and Patrick as they travel through time to fifth-century Rome to locate a missing silver cup. After returning to Whit's after finding the Viking sunstone, another letter is left this time requesting a silver cup that belongs to a monk. If found, this cup may prevent the mysterious Albert from being imprisoned. Emperor Honorius is hosting a gladiator battle at the Roman Colosseum in honor of a war victory. Beth attends as a slave and Patrick attends as a monk's apprentice, until he is taken prisoner and sent to fight in the arena. While in Rome, the cousins meet Telemachus, a monk that believes fighting is wrong and who is willing to give up his life to stop the killing. When Beth and Patrick find the cup and return to their time, a new letter is waiting for them with information on the mysterious Albert's fate.

#3: Peril in the Palace: The place? China in 1271. The quest? The golden tablet of Kublai Khan. The problem? Just about everything! The Imagination Station adventures continue as cousins Patrick and Beth are kidnapped by Mongol warriors. Only the friendship of fellow traveler Marco Polo saves them from harm. They are brought to the Mongol palace where the Kublai Khan dislikes both their gifts and their message about Christianity. The tension grows when the Mongol magicians challenge the cousins to a spiritual power showdown. As war breaks out, Beth and Patrick are locked in a secret room to prevent their escape. How do the cousins get the golden tablet they needs to save Mr. Whittaker's friend Albert? How do they escape the city and find the Imagination Station? Ever the perilous palace and find out!