'Spillover' by David Quammen explores the intricate and often alarming ways emerging diseases in wildlife make the jump to humans, a process called zoonosis. Quammen's globe-trotting journey alongside top disease scientists uncovers the histories, challenges, and dangers posed by pathogens like Ebola, SARS, and AIDS, originating from animals such as bats, apes, and rats. With vivid storytelling, he poses probing questions about the next big pandemic, our role in these spillovers, and our preparedness to combat them. This scientifically insightful and meticulously researched narrative elucidates the urgency and complexity of global health in the face of pandemic threats.