Agatha Christie meets M. Night Shyamalan in Devil, and damn if the mystery author's inspiration doesn't put the hack auteur's career back on the right path. Make no mistake: There's nothing special about Devil, but after a string of notorious flops, it's surprising to see Shyamalan involved with a film that's at the very least watchable. Still, any praise should be followed by an asterisk, since his contributions are relegated to co-producing the picture and coming up with the story line (John Erick Dowdle and Brian Nelson get credit for the direction and screenplay, respectively). But regardless of how the muted kudos is parceled out, the end result is a moderately entertaining tale that borrows Christie's Ten Little Indians template of putting a group of strangers together and having them get picked off one by one. Here, we find five people trapped together on a stuck elevator, with the added element of having the killer among the quintet actually being the devil in disguise. The supernatural angle occasionally lapses into silliness (the pontificating by a superstitious security guard grows overbearing), but Dowdle comes up with some interesting visuals, and the atmospheric score by Fernando Velazquez (The Orphanage) is, uh, heaven-sent.