This is a really interesting idea - an insomniac, Thea, heads to a specialist experimental sleep clinic on an island in the hope that they will help her to sleep again.

However, the experiement is not as it seems and the reader is pushed along on a well paced thriller as Thea tries to work out what is going on and how she will survive.

Loses a star simply becuase there is a concept of a face in a window which the writer clearly needs to draw upon.... and so on numerous occassions clunkily throws it into text until finally the plot pulls together.

Thanks for NetGalley for the ARC in return for an honest review :-)