Sleeping Giants is a great science fiction thriller/mystery with a fun hook: a girl biking through a forest falls in a hole and lands on the palm of a giant metal hand. The more people learn about this artifact, the weirder it gets. And it gets seriously weird.
The book is told through journal entries and interviews, with the interviewer being a nameless interrogator who wields shocking amounts of political and military power via unknown means.
Recommendation: Read it! I haven’t revealed much about the plot or characters because I don’t want to give away any of the juicy reveals of the book. But definitely give this one a try.