Paul Strathern makes a promising beginning. He tells us about Heidegger's early tendencies of mind, recounts the overriding events and the challenging philosophical situation of his time, and explains the philosopher's original philosophical project and some of his key concepts.
But Strathern goes astray in the latter part of this short book, offering a glib and sarcastic rebuttal to Heidegger's thought, making light of his style of writing, and devoting far too much space to his Nazism, as though only heroic persuasion could keep us from embracing Hitler.
No serious thinker deserves this kind of treatment. It insults not only Heidegger but also the readers, who are evidently expected to adopt Strathern's opinons as final rather than forming their own. The impression you end with, whether he intended it so or not, is that Heidegger was just too wrongheaded and obscurantist for us to bother ourselves with him.
If the pages wasted on Strathern's reactions had been used to give us more Heidegger information and to integrate that with the previous material, the book would have been worth the money and the hour and a half.