After the success of the first case you've had as a detective, Interpol has given you another strange mystery. The Loch Ness of Scotland is becoming a site of interest for many recent disappearances. Many people are thinking that the famed plesiosaur Nessie has something to do with the disappearance. You take the case and head over to Scotland the day after the latest disappearance.
The Scottish police that are now investigating the area have given you the address of their station. You head there first before going to the lake. You ask the lieutenant if anything happens each time a disappearance occurs. The lieutenant does mention that each one occurs on a foggy day. It also seems like the fog is a bit whiter and denser than normal fog. With this in mind, you head over to the famed lake.
The first thing you notice are the messes of footprints near the lake. It seems like they sort of enter the lake, but the shoe prints don't seem to signify that the people that left them went into the lake. This means something or someone must have washed parts of them away.
As you walk along the edge of the lake, you come across a local reading a newspaper, and luckily, they're willing to talk since your first case made headlines. You ask them about the missing people and they give you a vague thing that they kind of remember. All of the missing people blended in with the fog. This means that if you could look at them in fog, they would still be hard to see.
As you walk along the lake you notice a patch of grass that doesn't seem to be like the others. Closer examination reveals that it is a door underground. As you ponder everything you've learned, you realize how simple everything comes together. Here are the suspects
Age: 19 years old
Profession: None, university student
Age: 35 years old
Age: 27 years old
Profession: Scientist and Nursery Assistant
What was the trapdoor hiding and where is everyone?