Émilie du Châtelet (1706-1749) and Mary Somerville (1780-1872) were among the leading natural philosophers and mathematicians of their age, celebrated for expounding and extending Newton's Principia and for their own work in calculus, optics, gravity and energy. We can only imagine what else they might have accomplished if they had been permitted to enrol at university and participate in the public life of the mind as fully as the men who they challenged and inspired. Seduced by Logic is an exploration of passions both physical and metaphysical, and potential both realised and frustrated. It brings to life two remarkable women and the fundamental riddles of the universe that they worked on together across the centuries.