Broken Sword 2: The Smoking Mirror Part 19 - A Tale of Two Museums
It makes sense that the trail for both George and Nico would both wind up in museums, temples of the past that help educate those of what has gone so they can better face what has yet to arrive. For George, it was a considerable effort to get into the museum once he got there but for Nico that's not the case; the British Museum is free to enter, with only special exhibitions and some events costing money to enter. A huge building, it contains a myriad of items from all ages of history but only one interests Nico. She needs to locate one of the obsidian stones needed to ensure the entity without the smoking mirror doesn't escape, so it's time to start searching. With luck it'll be there and then it's just a matter of finding a way to take the artifact from under the noses of the museum's security and staff.