Fragile Eternity picks up where Ink Exchange left off. Nothing too drastic has changed between Keenan and Ash, except that summer is drawing closer and because of that, they feel this pull towards each other. Ash is beginning to feel responsibilities for her fae, but is still having a hard time identifying with them. She enjoys the perks of being fae, but wants to hold on to her mortal life, as well.

This book really focuses on Seth. (Um, Yummy.) He's having a really hard time dealing with Keenan and Ash's relationship, even though Ash promises that it's platonic and only a "job". Fae can't lie, remember? He's determined to find some way to spend eternity with Ash, and it seems like everyone else is just as determined to keep him mortal. In a world where everything can hurt him and he's always in harms way, Seth truly is a weak link in Ash's life. Seth ventures deeper into Faerie to find some way to be with Aislinn.

When Seth disappears for 6 months, Ash needs to decide whether to choose to be happy or to mourn Seth. Decisions are made that will change everything, and relationships are changed forever.

One thing I really liked about Fragile Eternity is how the reader gets to explore more of Marr's fae world. You meet rulers of different courts, and see how the outcome of Ink Exchange effects relationships between the Summer, Winter, and Dark Courts. You see Seth becoming not only a "mere mortal pet", but an important part of the story. As for Keenan, I personally went from disliking him, to feeling bad for him, back to disliking him. I'm not sure what will happen with the Ash-Seth-Keenan triangle in the final installment in the series, but it's sure to be wild, dramatic, and heartbreaking.

Fragile Eternity is a book about what you'll do for love, what you'll risk, and what it's like to face failure.