I've enjoyed Shana Abé's 'Drákon' series (The Smoke Thief, The Dream Thief and Queen of Dragons) but found this fourth novel in the series slightly disappointing. Not because of the writing style – Abé continues her lyrical, descriptive writing of the life of the Dragons – but because somehow the plot in this story didn't quite work for me.

Zoe Cyprienne Lane is a mere seamstress's daughter and nothing special, even if she did have a close childhood friendship with the Alpha's son, Lord Rhys Langford. But life and Rhys have moved on, and she's engaged to a good man. However, when he goes missing, she decides to travel to Paris to find him. Unknown to all those back home, Zoe does have some drákon skills, and they may help her find Hayden, her fiancé.

Zoe also sees the dead, and when Rhys Langford starts haunting her, things get more complicated - especially as he is able to do strange things in his ghostly form. Together they search for Hayden, but Zoe's feelings may well be changing. And who is the mysterious trapped dragon, and can he also be rescued?

Although an enjoyable read, I wasn't always too sure of Rhys's morality and behavior in The Treasure Keeper. Zoe is a strong and self-reliant woman, which is appealing, but I didn't feel that I entirely got to know her. This feels more like a transitional book than a full story in its own right. Although it is ultimately resolved properly, it's not completely clear if Zoe will be happy when she returns home.