Make your way from Mademoiselle Lenormand shop to Notre Dame. This will also give you the Animus Database Entry for Nicolas Flamel. You will need to go inside the Cathedral to find them. There are a total of 6 but only one of them has what you are looking for.
To locate the Cult Members inside Notre Dame, you will need to head to the far end of the church from the entrance. You will see a large crowd in the area. Blend with the crowd then use Eagle Vision to locate a few of them.