An Unwanted Guest

It was engrossing, as it should be, with the usual myriad of lives put together by accident in a hotel and snowed in. But I don't much care for endings that bring completely unknown factors such as somebody who knew somebody else and had a secret on them and you could only know about it reading that exact page. It seems a bit sloppy, as if the author didn't know a way of untying the mystery and that page had been inserted there.