A highly impressionable installment in the “Don’t Ever Leave Home” subcategory of the horror genre, “The Descent” follows Juno (Natalie Mendoza), a rugged outdoorswoman who suffers a personal tragedy and whose subsequent one-year-later spelunking expedition turns into a rather extreme form of survivalist psychotherapy — one complete with deadly subterranean monsters. Juno and her five companions — Sarah (Shauna Macdonald), Beth (Alex Reid), Sam (MyAnna Buring), Rebecca (Saskia Mulder) and Holly (Nora-Jane Noone) — meet at a cabin in the Applachian Mountains and embark on exploring what ends up being a vast (and unmapped) system of caves; as they descend deeper into this ancient underground labyrinth, they encounter something much more dangerous than tight spots and sudden drops: a race of flesh-eating humanoid creatures with voracious appetites and years of environmental adaptation on their side. Director Neil Marshall, following up his successful werewolf film, “Dog Soldiers,” opted for an all-female cast rather than the co-ed ensemble of the original script, making for that rare horror film in which both the macho heroes and the damsels in distress are the same gender. – IFC Staff