Hailed as the Queen of nineteenth-century science, Mary Somerville was a formidable force in the fields of mathematics and science. This new biography celebrates her as a pioneer and groundbreaking influence. For her input, she was esteemed in her day and remains a beacon for new generations of scientists. Beyond the scientific realm, she holds iconic status for breaking new ground in the fight for women's rights - her name was the first to appear on the original petition sent to Parliament to allow women the right to vote and she was a vocal advocate for women's equality. At a time when women were barred entry from most influential institutions, her induction as the first female member of the Royal Astronomical Society was truly extraordinary. Amongst her scientific achievements, her work led to the discovery of the planet Neptune. Sir David Brewster, inventor of the kaleidoscope, wrote that she was 'the most extraordinary woman in Europe - a mathematician of the very first rank'. She features on the new Scottish GBP10 note, after winning a public vote and defeating competition from esteemed rivals such as Thomas Telford and James Clark Maxwell. This new biography explores every facet of a fascinating life, the legacy of which continues to be felt to this day.