The Perfect Couple Mystery (S02E09)

Father Dowling and Sister Steve get caught up in a mysterious security investigation after one of their parishioners is accused of pilfering sensitive documents. The case involves a supposed spy who turns out to be anything but, a mistress who never came into the picture, and a husband who isn't actually cheating. To complicate things further, there's an FBI headquarters that seems to be a figment of imagination. With all these twists, the situation is as muddled as a bowl of Irish stew.