The third installment of what the filmmaker calls an “accidental trilogy” catches up with a cohort of friends confronting the challenges of their 70s while reflecting upon the winding pathways of their lives. The film interpolates and interrogates footage from two previous installments—Riverdogs (1978), a 16mm accounting of Moss and friends’ outdoor, rent-free life on the Colorado River, and The Same River Twice (2003), in which the friends reckoned with their move from being young and naked to clothed and middle-aged—offering an elegant and profoundly emotional journey of experiences accumulated, selves lost and found, and perspectives endured and achieved. Though Moss mostly remains off-screen, his evident closeness with the on-screen subjects is defining of an open and unendingly inquisitive cinematic practice, culminating—for now—with this magisterial construction from nearly 50 years of conversations, candid moments, and trips down the river.