First off, I read these Boxcar Children books when I was a lot younger. There were some that I would read over and over and others that I read once and chucked to the back of my bookcase. Overall, though, I loved them all.
This was one of the stranger BC books. I have never been to the Falls, but I definitely want to go now and see if things were like how the Alden family found them to be (especially the Maid of the Mists). The mystery didn't seem to be so much of a mystery for me, rather than just some events that were happening. But I do like the Holiday Special series regardless!