If we can unlock its secrets, the force that keeps our feet on the ground holds the key to understanding the biggest questions in science: what is space? 

No one has covered the topic with such a light touch and joie de vivre, a delight' Brian Clegg. What is time? What is the universe? And where did it all come from?

Award-winning writer Marcus Chown takes us on an unforgettable journey from the recognition of the 'force' of gravity in 1666 to the discovery of gravitational waves in the twenty-first century. And, as we stand on the brink of a seismic revolution in our worldview, he brings us up to speed on the greatest challenge ever to confront physics.