The guns of Navarone
I'm not usually a huge fan of fictional adventure stories, but this was an enjoyable read. Characterisation isn't that wonderful, but then that's not what this book is about, it's a real gung-ho adventure story that hits the ground running from the off.
There's the obligatory nasty Nazi, but generally the book is surprisingly even handed in its portrayal of the enemy. What I found most interesting was the transformation from the book to what has become its better known version, the film.
I think this is one of those very rare instances where the film is actually better than the book that first inspired it. The Guns Of Navarone [DVD]  tightens up the plot and gets rid of a few of the discrepancies, and the major change in the sex of the partisans, and the traitor, add enormous drama. It's quite an object lesson in how to improve a screen play.
I don't think I would read The Guns of Navarone again, but it certainly provided me with an enjoyable afternoon, and made me want to re-read Ill met by moonlight, a real tale of daring-do in Second World War Greece - so extraordinary you really couldn't make it up.