Escape from the Past: The Duke's Wrath

When nerd and gamer, Max Anderson, tries out an experimental computer game, he doesn't realize he's playing the ultimate history game, time-traveling into the past...anywhere...anytime. Survival is optional. To return home he must decipher the game's rules and complete its missions--if he lives long enough. To fail means to stayin the past--forever. 
 
Now he's trapped in medieval Germany, unprepared and clueless. It is 1471 and he quickly learns that being an outcast may cost him his head. Especially after rescuing a beautiful peasant girl from a deadly infection and thus provoking sinister wannabe Duke Ott. Overnight he is dragged into a hornets' nest of feuding lords who will stop at nothing to bring down the conjuring stranger in their midst.
Fans of time-travel and historical action/adventure and kids graduating from the Magic Tree House series will love this trilogy based on actual historical events, locations and people.