Published in 1984, TIL does have a bit of a dated feel, but all in all it is still an interesting first contact story, albeit one with lots (too much?) Earthside intrigue and other secondary plots. TIL is a very 'populated' book, with several main characters and an almost endless swapping of POVs, including various alien ones; this can get a little tedious at times, but the unfolding plot pulls the reader along nicely (if a little slowly).
Without much of a spoiler, certain entities on Earth are aware of an approaching alien ship approaching Earth. Recently discovered tachyon technology (tachyons travel much faster than light) allows for transmitting signals via tachyons and by this, strange, musical messages were received on Earth from the alien ship. The powers that be decide to keep this on the hush hush and have a team sworn to secrecy at the tachyon research center outside of New Phoenix; the year is roughly 2035 or so. Besides researching tachyons, the team also is experimenting with advanced A.I. with the hopes of sending a 'super' A.I. diplomat to the aliens; part of the research here also involves brain scanning techniques for human which might one day allow the transfer of consciousness to a computer. Both the A.I and brain-to-computer themes have been basically done to death in science fiction, but then again, this book is almost 40 years old now and the themes were not quite passe then, so I can cut Carver some slack.
TIL takes a long time to get underway, where we are introduced to a wide host of characters, their significant others, their lives, etc. Perhaps the most important protagonist is Mozy, a late 20s something woman who is described as a lonely 'waif', an 'outsider', etc., with low self esteem to boot. Females in TIL are really bland stereotypes, but to be kind to Carver, the men are not much better. What drives the story is the plot, although the semi-vapid character development slows the unfolding to no small degree; this is a bit of a doorstop at 540 pages with tiny typeset after all.
Anyway, Mozy works at the tachycon research center where she enters 'mindlinks' with the A.I. the secret cabal is planning on sending to meet the alien ship. The ship, Father Sky, is already on the way and the story begins with it about a 1/4 light year from Earth. The plan is to finish up the A.I (called David Kadin BTW) and basically beam him to the ship via tachyon transmission. The fly in the ointment, however, is Mozy, who falls in love (head over heels) with David, not knowing that he is really a computer program! The research center works on a need to know basis and secrecy is the prime commodity.
Mozy, with the help of another worker at the center (who knows a lot more than she does BTW) comes up with a plan to brain scan Mozy and send the scan to Father Sky ahead of David. He does not tell her his plan, nor that David is a program, but so be it. Mozy 'awakens' on the ship and it takes awhile for her to realize what is going on. This part had a serious 'Tron' feel to it, making it feel pretty retro to say the least. Eventually, David is also 'unpacked' on the ship and it is off to meet the aliens!
The aliens-- the Talenki-- are really what saves this story, but even they are more 'eye candy' than substance. It seems they can communicate over vast distances and are in touch with many other sentient creatures, including whales here on Earth, along with beings on Pluto, Titan, and other place in our solar system. I will stop with the plotting here, but there is still quite a bit left of the story.
I mentioned the A.I. and mindscan theme-- that is the tech that really drives the story, and yes, it is a bit old hat. The aliens are interesting and were the saving grace to the story; the stodgy characters, imbued in their stereotypical relationships do not give you much to root for otherwise. The political scene on Earth was decent, albeit once again, a bit of a stereotype. All in all, a decent first contact tale, but nothing too deep. 3 stars for the nostalgia value!