Fate Undone can certainly be read as a stand alone. I do recommend that readers take the time to read the series, as readers will gain a better understanding of the Mythean Arcana world created by Linsey Hall. Linsey has a way of creating characters that are strong and perseverant, despite the odds against them. 
 Yay for Logan (Loki), he gets his own story, which is hinted to in Stolen Fate. As the story begins, Logan falls in love with a demigoddess, Sylvi. Leaving Sylvi was the hardest thing Logan ever did, despite his actions his love never waivered. In an tempt to get her back the reader is taken through time, leaps dimensional planes, all to once again claim Sylvi's heart, that is if Logan can complete his quest. Otherwise it will cost him and Sylvi their minds... 
 Great continuation to the series, I am looking forward to the next book! I recieved a copy via Netgalley. 4.5/5 stars