Five women go on a hike. Only four return. Jane Harper, the New York Times bestselling author of The Dry, asks: How well do you really know the people you work with? When five colleagues are forced to go on a corporate retreat in the wilderness, they reluctantly pick up their backpacks and start walking down the muddy path. But one of the women doesn't come out of the woods. And each of her companions tells a slightly different story about what happened. Federal Police Agent Aaron Falk has a keen interest in the whereabouts of the missing hiker. In an investigation that takes him deep into isolated forest, Falk discovers secrets lurking in the mountains, and a tangled web of personal and professional friendship, suspicion, and betrayal among the hikers. But did that lead to murder? " Force of Nature bristles with wit; it crackles with suspense; it radiates atmosphere. An astonishing book from an astonishing writer." --A.J. Finn, author of The Woman in the Window Select praise for The Dry "One of the most stunning debuts I've ever read. Every word is near perfect. Read it " --David Baldacci, #1 New York Times bestselling author "A breathless page-turner ... Ms. Harper has made her own major mark." --The New York Times