I liked this. I it came up on offer on Amazon, and having an interest in the Underground I couldn't help it. Very impressed. It has twists and turns and I didn't find any of it beyond belief, which can be the case with espionage novels. Also makes a change to have an entire book without a single bit of swearing or graphic violence. Definitely recommend this book for a bit of escapism, especially as it's set in real parts of London - the description of South Croydon is still accurate, 25 years on!