Patrick and his cousin Beth travel back in time to ancient Rome, where they meet Telemachus and help put an end to the spectacle of gladiators fighting to the death.

Cousins Patrick and Beth travel in Mr. Whittaker's invention, the Imagination Station, to thirteenth-century China, where they meet Marco Polo and Kublai Khan and are mistaken for Christian shamans.

Eight-year-old cousins Patrick and Beth find themselves 1450's England during the War of the Roses, where they discover the missing treasures and meet the person who has been sending notes through the Imagination Station.

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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....

Kidnapped by Celtic Druids in 433, Patrick and Beth are headed to certain death when followers of a former Irish Slave (Saint Patrick called Patritius in this book) save them. The cousins find themselves in the midst of a power struggle between Ireland's King Logaire, Patritius, and the leader of the Druids, Lochru.

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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....

Time-traveling cousins Patrick and Beth go to ancient Egypt, where they try to find ways to encourage Tabitha, a Habiru girl, and her people, who are being enslaved, to keep faith and hope alive, by exploring the tomb of her people's prince.

"Knowing that death is in store for the Baby Jesus if the soldier finds Him, Beth and Patrick carry out a plan to keep the baby safe"--

On the eve of the American Revolution, Patrick and Beth travel back in time to deliver a letter to Paul Revere.

"Travel two centuries back in time to the final battle of the American Revolution at Yorktown, Virginia. Cousins Patrick and Beth sneak through trenches and race across battlefields to warn General George Washington about a dangerous spy. The spy is stealing his secret plans and giving them to the British. Cannons roar and the ground shakes as the struggle reaches a climax. Washingtons ragtag soldiers are up against the most powerful army in the world....