From The Economist:
"Engels was an enigma. Gifted, energetic and fascinated by political ideas, he was nevertheless ready to play second fiddle to Marx. “Marx was a genius; we others were at best talented,” he declared after his friend's death. Mr Hunt does a brilliant job of setting the two men's endeavours in the context of the political, social and philosophical currents at the time. It makes for a complex story that can be hard to follow but is well worth persevering with."