Gosh, this could have been written in 1964. Maybe it was. Or it's a tribute. Or a primer for beginning SF readers. Or all of those.
We start with a well-worn old plot: an interstellar ship is ready to go, the government doesn't want it to go, and our heroes do a strictly-by-formula let's-go-anyway exit. We have an FTFTL ship so we can go lots of places (others would say a ship that is coated in narrativium).
Some actual plot-advancing stuff happens as they find things. Time for a search, hop, hop hop, here's a Lost Civilization. Let's take the lander down! It's a bit cold here, but we can breathe it, how convenient. Aliens who are almost like us, with chairs (just like ours despite the residents having tails, think about that) and drawers and a kindergarten and probably comic books and gum under the desks.
Search #2, hop, hop, hop. Aha, there they are! Let's take the lander down! What could go wrong? (reader goes "heh,heh, narrativium again). Oops! Oh well, breathable air and Earthlike temperature, how convenient, and the aliens are really nice. And they have dial telephones, powerboats, churches, and all that, despite being upright dolphins that somehow evolved fingers.
Oh, remember when the author told us they cut some corners in leaving early? I reckon Jack added that after realizing that the crashed lander thing only works if they didn't get around to waterproofing the comm units, and they ALL got wet and NONE of them work. Lucky the frammis repair units stayed dry. BTW, what are we doing landing in a planet in a machine that is so fragile that a frammis might fail at any time, so much so that handy spares are always available like headlight bulbs or fuses? Let's face it, the lander crashed because the plot needed it to crash.
OK, we're flying again. Another search. So let's go to the Goldilocks formula like so many novels before us. This one's too big, this one's too small, now let's show off our SF chops: this one's tidally-locked, this one has a binary star so it's unstable, this one's all volcanoed out, ... oh look! This one's ju-u-ust right. Let's take the lander down! No need for discussion, Hutch decides and we're all cool because we know she always gets our asses out somehow.
OK, discussion has been productive, let's go back to Earth, where, as in all SF, the politicians and administrators are ALL corrupt and incompetent (although somehow they built intergalactic FTFTL, but SF books are always set in the bad-leaders years). Let's take the lander down! What could go wrong?
And we end with the story leaking to the media, as in about 50 other SF novels and probably a couple in THIS SERIES. Sigh.
HOWEVER. Underneath all that lazy plotting and lazy writing and lazy worldbuilding there hides a quite reasonable discussion of a scenario. Thing A threatened place B, they fled and left a message that we found, we look for B and find C, which is threatened by A. Can we help? Should we? Will our Evil Overlords let us? Should they?
Hmm, as I type this it reminds me remarkably of another recent read.
This is Robert Heinlein writing The Three Body Problem!
Anyway, I didn't expect a groundbreaking Nebula winner, and I didn't get it. It's a decent read.