What does Reverend Parris reveal about his niece Abigail?

In Arthur Miller's "The Crucible," Reverend Parris reveals that his niece Abigail has robbed him and left Salem with Mercy. This occurs in a conversation between Parris and Reverend Hale in Act IV of the play, while both are at the Salem jail to convince the prisoners to confess.

"The Crucible" is a play that tells a fictionalized play account of the Salem witch trials of 1692. It tells the story of several girls, including Abigail, who accuse several people of witchcraft. As a result, several are found guilty and sentenced to death. The play first premiered in 1953 and was written as a metaphor for the McCarthyism of the time.