This is a journalist's expose and reads like it, like one of those rushed out books that come out. It thus leans sometimes too heavily on idle thinking, rather than actual revelation.
But, for the most part, this is a complete and detailed expose on the British Government's culpability in the virtual destruction of China by the deliberate 'enslavement' of its people to opium.
(Although the books was written in the 1910s, the result of this was the collapse of the last Chinese dynasty, a weak and feeble republic ripe for Japanese invasion, followed by civil war and the establishment of ongoing dictatorship).
The tragedy of this amoral way of funding an Empire, (India), is aptly described in detail. If I remember my facts correctly, over 90% of people in China smoked opium by the end of the nineteenth century. And this slow death was all entirely deliberate.
I have read this book for audio format on librivox.org. Check out my lilting (and slightly outraged) tones.