Sister Sandrine's been in charge of all the non-religious aspects of church operations at Saint-Sulpice for over a decade.
She gets woken late at night by a phone call from the abbé, who's asking her to grant a favor to a visiting Opus Dei numerary who apparently can't wait until morning for a tour of the church. Bishop Aringarosa requested the favor himself, so she has no choice but to accept.
Sister Sandrine's suspicious of the Opus Dei organization, knowing that their good favor from the Pope was undoubtedly due to a well-timed donation of one billion dollars, bailing out the Vatican Bank from an "embarrassing" bankruptcy.
She especially finds this request odd, because the Church of Saint-Sulpice is known for it's unique qualities that are only apparent in the daylight.
She agrees to meet the numerary at one a.m., with an uneasy feeling about the whole thing.
Call it women's intuition, but this whole plan smells fishy.