This book is pretty okay. It's par for the consistently readable if somewhat unexceptional Academy series. Except for just one thing.
You see, at the end of the previous novel, Cauldron, one character mentions how he's been researching the existence of other universes and whether perhaps it might be possible to travel to them. And so, when I started this novel and came across the first instance of this anomaly, I thought, "Now wait one second. Is this a continuity error? Or is it a hint to observant readers that this is not taking place in the same universe as the previous books?"
In Starhawk, McDevitt assigns a name to the foggy gray dimension that interstellar ships enter in order to effect FTL travel. Previously only referred to as "hyperspace", it is now named "Barber space". The term is used several times throughout Starhawk.
This fictional term, "Barber space", first appears in the series in Cauldron, as one of the names considered and rejected for an entirely different hyperspace dimension. This different dimension is a more recent discovery, and it enables much faster travel than the hyperspace known before it.
This rejected term "Barber space" originates from the name of the character who was most integral in discovering the new hyperspace and developing a drive to put ships through it, Henry Barber. Henry Barber was not, as far as the Academy series ever mentions up to this point, ever a part of the development of the older FTL technology. It is implied, though not certain, that Henry Barber was not even alive at the time it was developed. Rather, the person to whom that technology is attributed is Ginny Hazeltine, and the "Hazeltine drive" or "hazeltines" which ships use to travel in hyperspace are named after her.
But, after finishing the story, this name does not seem to be related in any way to parallel universes. This isn't an alternate universe where Ginny Hazeltine never discovered hyperspace and it had been left up to Henry Barber instead. It was just an egregious continuity error, and it drove me up the wall.
Jack why. It's hard for me to see how this could be an accidental error, since it made it past both you and whoever reviewed your drafts. But I can't explain it any other way. How do you even miss something like this?