Indeed, in many ways this book is as much an ode to the value of education and knowledge as it is an adventure story.

FORBES: The Weekly E-Book Reading List

Many travellers ventured on to the Silk Roads drawn by the attractions of trade, adventure and also knowledge and, in the nineteenth century, by new archaeological discoveries.

UNESCO: Culture

But it would be wrong to say that we didn't have some of the excitement of a boy's adventure story - sharpened by the knowledge that the writer and traveller Tim Butcher had failed to find the waterfall when he walked in Greene's footsteps.

BBC: Following Graham Greene to Liberia's sacred waterfall