This is an old book by my favorite author which I just read. And wow, it was really, really nice. I wasn't able to guess who the killer was. Everyone has a motive, everyone has a way to do it, in short, everyone is a suspect, of course, except the victim. Mary Higgins Clark always has a way of not letting people know who the real killer is until the end. Well, many authors can do that but she does it really well.

In Nighttime is My Time, 5 girls who eat lunch together during college died in different ways and at first, investigations just say it's natural deaths. Anyway, story is really good. I can't say more. I don't know how to tell it without revealing more :)