In London, where the most gifted teenage ghost-hunters venture nightly into perilous combat with deadly spirits, amidst the many corporate, adult-run agencies, one stands alone: independent of any commercial imperative or adult supervision - a tiny startup, run by two teenage boys and a newly arrived, supremely psychically gifted girl, a renegade trio destined to unravel a mystery that will change the course of history: Lockwood & Co.