Agatha Christie had it figured out. Ten victims, one killer. Set it up, knock 'em down.

And while there's something to be said for simplicity -- writer-director David Twohy opts for three couples with two killers among them -- A Perfect Getaway can hardly sustain itself until the suspense can kick in. Unable to cut to the chase, Twohy takes his time and decides to get coy, and as it turns out, the only thing deadlier than a killer in a thriller is a screenwriter.