This is not always true. Some of her cases are long and complex, some involve physical peril, and a few never have been solved. The one I'm going to recount here, which we've always referred to as "the vampire case," was not easy, and, while it was solved, it was certainly not solved in the first few hours.
My employer and I ate lunch from time to time in a very small coffee shop, apparently called "Eat." The hotel where we lived and worked was quite a distance from the hospital, and the coffee shop was about at the halfway point, so it was convenient, especially since my employer often got light-headed if she went too long without food.