SUSANNAH CHARLESON is the author of the New York Times bestseller Scent of the Missing and The Possibility Dogs. A flight instructor, service dog trainer, and canine search‑and‑rescue team member, Charleson began a non‑profit organization called The Possibility Dogs, which rescues, trains, and places dogs with people suffering "unseen" disabilities. She lives in Texas with her ever-growing brood of animals—canine, feline, anything that needs rescuing.