Run To Ground
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The whole run away plan of the Forsters is explained and some chapters are written from their point of view. This gives the readers a better understanding of their situation and makes the turning point much more surprising, because you, as a reader, think you know everything that is going on. The important thing is that more people than you know are hiding secrets. A case that at first seems easy (for the reader; not so much for the police who don't know the Fosters' point of view) becomes more and more complicated the more you read.
Something I liked about this novel is that several lab techniques and important concepts (like GSR) are described. It's good if you already know what they are and how and when they are used, but if you don't, that won't stop you from enjoying this novel, because you get a short but very understandable explanation.