I read this book years ago when it first came out. This past year I did a re-read of "Enterprise: The First Adventure," and I read "The Captain's Oath" by Christopher Bennett, and about 2 or 3 years ago I read the "My Brother's Keeper" trilogy by Michael Jan Friedman that focused on Kirk before he was captain and the time between "Where No Man Has Gone Before" and "The Corbomite Manuever". So it seemed logical to re-read this novel since it took place partly during the same period. As far as Captain Kirk goes it feels closer to "Enterprise: The First Adventure" than it does to "The Captain's Oath" and "My Brother's Keeper". Which is probably to be expected since this was written about the same time as E:TFA. In E:TFA Kirk is more rough around the edges, quick to say things without thinking and still needing some refining. Whereas in TCO and MBK I find Christopher and Michael Jan Friedman go with a more reserved, contemplative by the book Kirk as reflected in the first season of the original series. Strangers From the Sky, on the other hand, is much more consistent with WNMHGB than Vonda McIntyre was in E:TFA. Strangers...has the crew consistent with WNMHGB first of all. She does make a nod to E:TFA by saying McCoy had left the Enterprise to deal with personal issues so Dr Piper was asked to come back from retirement to take his place temporarily (in E:TFA Kirk tries to contact Dr Piper to come out of retirement because they couldn't find McCoy at first). But Kirk in Strangers.... much as in E:TFA, is impulsive, speaking without thinking and ready to take quick action without having all the information. Other than the retconning of the characters from E:TFA to WNMHGB this novels seems like it can naturally follow E:TFA pretty well (though I guess it's more correct to say E:TFA was the retcon). As to the plot. The book is in 2 parts. The first part is sometimes before TWOK. Spock is captain of the Enterprise running training missions while Kirk is supervising the cadet training as we saw in TWOK. Part of the first book is also devoted to Vulcans accidently crash landing on Earth 20 years before first contact was supposed to take place with them. The history of the Federation as it was known then was recounted at the beginning. It is vastly different than what we would later see in TNG and particularly First Contact. I believe the history was based on an old game if I'm not mistaken, where Earth goes out first to find new life, on Alpha Centauri, and first contact with the Vulcans occurs when an Earth ship rescues a disabled Vulcan vessel. Also, at this point, World War III and the Eugenics Wars were the same. They had not yet been split into two separate conflicts. The 21st century portion of the book takes place around 2045 and depicts an United Earth largely recovered from the last World War, though Earth is still developing into the society it would be later. Kirk and Spock are having disturbing dreams after reading a book describing an alternate history and then they learn they were involved with an early mission to repair history. Then begins the 2nd part of the novel. That part takes place before WNMHGB (and an indeterminate time after E:TFA). They discover a planet that is appearing and disappearing at random intervals and when they take a landing party down they end up lost in the 21st century. They discover that Vulcans were on Earth more than 20 years before they were supposed to be. So each member of the landing party (the same members it is noted who would transport to Delta Vega some time later) goes out to try to find out what is going on and fix the damage to history. While it does not fit in the existing continuity of the Star Trek universe as it stands today, I found it an excellent novel nonetheless. It was an enjoyable read front to back. The Enterprise episode "Carbon Creek" has some similar themes in Vulcans landing on Earth after an accident years before first contact was supposed to occur. Though the episode and the novel follow vastly different courses after that.