Up the Line is a ribald, Byzantine tale of time-tourism from multiple Nebula and Hugo Award-winning author Robert Silverberg.

It's 2059 and Jud Elliott--former law clerk and failed Harvard history student--is at loose ends. Having left his previous job out of boredom, he finally takes a position as a Time Courier showing tourists around medieval and ancient Byzantium. Maybe that unfinished master's degree will come in handy after all ...

Jud is careful and he (mostly) plays by the rules, not wanting to get on the wrong side of the Time Patrol. But, on one trip up the line, he meets and falls in love with his great-great-multi-great grandmother and suddenly the rules don't seem as important anymore ...