The Lake is about a girl whose mother has recently died. She lives alone in a big city in Japan, and she's lonely. She meets the guy whose window faces her from across the street, and they begin dating. He moves in. She's not sure what it is, but there's something wrong with him. He's damaged in some way. He asks her to go with him to see two of his old friends who live near a lake, and she agrees to go. They arrive at a little cabin occupied by one nice guy and his bedridden sister. The friend puts his hand on his sister's head, and she speaks through him. Fine. So the couple goes back to the city. Long story short, it turns out that (spoiler!) the boyfriend had been kidnapped and brainwashed by a cult when he was a kid, and he has problems forming relationships. The End.
This book was a total waste of time. I read it quickly simply because I wanted it to be over. The translation is terrible, too. Here's an actual sentence:
Stacks of incomprehensible books about biochemistry and genetic engineering and so on would be stacked up next to him, their pages marked with Post-its.
Really? Mr. Translator, couldn't you have tried just a little harder?
I'm glad I didn't waste too much time on this one. I'll move on to something more interesting, though I'm not sure what that is, yet. Shouldn't be hard to find: I do work in a library, after all.