Brenner, one of the few outsiders to enter the secretive worlds of chocolate giants, Mars and Hershey, has written an entertaining, incredibly detailed, frequently amazing tale of intrigue, eccentricity and obsession. Now bitter rivals in the struggle for candy supremacy, Mars and Hershey began as small family businesses who co-operated to develop new products, such as Mars's best-selling M & Ms. Forrest Mars Sr, driven by dreams of empire, was an autocratic innovator whose aim was global domination. His sons, John and Forrest Mars Jr, members of one of the wealthiest families in the world, now work 80-hour weeks, deciding everything from the position of a pot-plant to the latest advertising campaign. Milton Hershey, whose dream was to create a utopia for workers, used his profits to build the town of Hershey, Philadelphia, and gave away his company to a charitable trust, which now funds the richest orphanage in the world. A Mars bar will never taste the same.