Before the Higgs boson, there was a maddening search for another particle that holds the secrets of the universe - the neutrino. First detected in 1956, it teased the answers to still more mysteries. But the hunt for the neutrino and its meaning has also involved adventures, from Cold War defections and extra dimensions to mile-deep holes in the Antarctic ice and a troubled genius who disappeared without a trace. Here, renowned astrophysicist Ray Jayawardhana delivers a thrilling detective story of revolutionary science from the dawn of the quantum age to today's most inventive labs.