Why It Scared You As A Kid: The two protagonists, Sue and Eddie, are sent back in time while visiting the Tower of London on a family holiday. Once there, they're locked up and threatened with execution because of time travel and maybe something to do with a King. Thinking you're going to be put to death is pretty terrifying as a kid but not being able to find your parents in a foreign city? Even scarier. Why It'll Scare You Now: Tourism in London is the absolute worst. These kids are voluntarily taking themselves to the Tower of London in the middle of the day? Who are the real monsters here?