Long Lost stars Adam Weppler (The Cobblestone Corridor) as Seth, a young man invited to spend a weekend at the Connecticut mansion of his long lost millionaire half-brother Richard (Nicholas Tucci, You're Next). With the help of his enigmatic live-in girlfriend Abby (Catherine Corcoran, Terrifier), Richard leads Seth down a psychosexual rabbit hole wherein luxury and temptation are intermingled with treachery and taboo.