Everyone nowadays seems to have problems—money, health, politics, personal commitment, sexual identity. But if you think things are tough in the present, wait till you experience the Middle Ages. None of that mythical Arthur-Galahad-Merlin stuff but the real thing—harsh laws, unruly peasants, primitive medicine, heavy taxes and the continual prospect of violence.
A dedicated scientist is willing to risk his life to prove the possibility of time travel. A wealthy sponsor is willing to risk not only his life but the lives of others in order to right what he perceives as an ancient wrong. A haphazard crew of half-trained men and women, many of whom think they are headed for a brief vacation, will be risking their lives regardless of any intentions of their own.
Lots of excitement, travel and adventure, and a chance to meet exotic foreigners. Simply remember this—despite anyone's hopes or plans, history might not agree to change.