Book recommendations at the bottom of the rabbit hole

Any good book recs for someone who is already pretty well read/studied on this topic? I haven’t really read anything from Jacques Vallee, but not sure where to start with him since his research goes so far back. I’ve watched so much YouTube and listened to endless podcasts on this topic, so I feel like I know a ton of the standard lore/theories/evidence, and I feel like an older book might not be giving me much. But open to being wrong on that, and interested to hear what y’all have read on this topic that you loved and would recommend to another enthusiast. Cheers!