You can also read this review on my blog 
 In short: Across A Star-Swept Sea by Diana Peterfreund combines an admirable protagonist, an affecting romance, and an engaging story line to make it an exceptional read. 
 In my review of For Darkness Shows The Stars, I mentioned how nice it was to read a satisfyingly complete standalone for once instead of making a commitment to stick it out with a long-winded series with a never-ending amount of loose-ends. Well, that was before Across A Star-Swept Sea was announced as a companion book that would tie into the original world, but could stand on its own as a separate story with separate characters. Now companion books, I can get behind wholeheartedly! I would be fine if companion books became the new series books. 
 Across A Star-Swept Sea accomplishes exactly what I wanted in a companion book to For Darkness Shows The Stars. Namely, that I get to see more of the fascinating futuristic world I loved and didn't have to lose the strong female protagonist and the emotionally-charged romance aspects that I adored from For Darkness Shows The Stars. Diana Peterfreund is one talented lady! She has definitely earned her spot on my must-read-author list with her captivating premises and exceptionally well written prose. I appreciate that she never dumbs things down for her readers - her plots are complex and are not super easy to follow, but are somehow so much more rewarding because of it. 
 Just as Elliot was the heart and soul of For Darkness Shows The Stars, so was the fearless Persis of Across A Star-Swept Sea. She is, in a word, awesome. But that doesn't really cover it. She is brave, altruistic, and caring, all under the guise of a vain and vapid twat. In one life, she has an entire court of admirers wrapped around her little finger and in her other life, she is the revolutionary spy feared by the rebels. Along with Elliot, she is one of the most admirable protagonists I have ever come across. Her relationship with Justen was a fun and affecting romance of the slow-building variety (the best kind!). 
 My only slight complaint is that I would have liked to have seen a bit more espionage and undercover sleuthing because that was the coolest part of Across A Star-Swept Sea - it's not every day I get to read about a revolutionary female spy, you know! As it is, Across A Star-Swept Sea is very romance-focused - which is fine because it was an excellent romance - but I personally would've liked to have seen a bit more action. Overall though, Across A Star-Swept Sea is a well written and engaging story that I highly recommend. I don't know if other companion books are planned yet, but I sure hope so!