Who Was Kate Greer? : Part 1

The wife of a university lecturer stands accused of perjury and perverting the course of justice. At a previous trial, she gave evidence against one of her husband's students, who was then convicted of stealing a valuable vase from the university. But the vase turned up at an auction three weeks after the student was convicted of stealing it. Where had the vase been? And did the lecturer's wife lie at the trial of the student?