Long before I read this book, three features had placed it firmly at the top of my Christmas hint list. First, it is set in my favourite period: that mid-eighteenth century era of artistic and scientific advancement that was to become known as The Enlightenment; secondly, because I knew its author's previous work, E=mc², which, despite its academically-sounding title, is the gripping story of Einstein's most famous discovery; and finally because I had heard its author speak fervently about it at the Hay Literature Festival.
The book's cover does not reveal - unless you recognise their pictures - that the "passionate minds" referred to are those of France's foremost woman physicist, Emilie du Châtelet, and the country's unquestioned literary genius, François-Marie Arouet - better known as Voltaire. The book is the story of their tempestuous affair.
Voltaire was a financial genius as well as a literary one, his astute investments ranging from importing Egyptian cotton via Marseilles in order to avoid import taxes - to rigging the State lottery to ensure that he acquired every ticket. His independent wealth gave his writing a devil-may-care quality: his characters skip from one subject to another like bees in a lavender patch, while his ironic humour and refusal to submit to censorship would sometimes gravely offend the King or the Church - and often both - causing him to spend much of his life either in the Bastille prison or in exile in England or Switzerland.
Emilie's genius showed itself in a more scholarly form, beginning by translating into French the theories of the 17th century English scientist, Isaac Newton, and later by devising experiments that challenged his conclusions.
For more than a decade, despite the fact that Emilie remained married to the Marquis of Châtelet-Lomont, she and Voltaire lived together in one of her husband's châteaux at Cirey, a small village in north-eastern France. Surprisingly, their intense relationship was punctuated by extra-curricular affairs by both parties: Emilie's part-time lover was the Marquis of Saint-Lambert, father of the child whose birth was the cause of her early death, while Voltaire's main dalliance was with his niece, Marie-Louise - to whom he returned after Emilie's death.
Although seldom mutually faithful, the partnership at Cirey was both collaborative and productive. Voltaire wrote many satirical poems, plays and essays there, establishing himself as the virtual chronicler of the Enlightenment movement, many of whose ideals are now enshrined in the European constitution. Emilie's researches were to result in the posthumous publication of her Mathematical Principles of Natural Philosophy, a work now generally recognised as a major contribution to contemporary physics.
There is much to enjoy in Passionate Minds: it is an eighteenth century biography told in Romantic style; sympathetically, yet humorously, written, and scrupulously researched. It would make a great BBC costume drama.
Theirs was truly a passionate meeting of minds, an alliance that was best summarised in the words of Voltaire himself after Emilie's death: "I have lost half of myself".