This was not the book I was expecting it to be. The backcover blurb talks about a girl (who we know will soon die) attempting to get a message to her father.

I’d just finished a book about a missing girl and was envisaging a serial killer or psychopath kidnapping kids. Instead the daughter in question is 20yrs old and this book is more of a thriller featuring government agencies, cryptologists and political dealings. So… not what I was expecting, but not necessarily an unwelcome read.