During a rash of mysterious disappearances, a horribly-injured, gibbering colt staggers into town, attacking everyone in sight. When Acting-Psychiatrist Twilight Sparkle is assigned to treat him, she begins to feel the pull of a stranger, darker world, hidden in the shadow of our own. In an effort to discover the truth, she gathers together a group of similarly-affected ponies to delve the secrets of the Dream Highways, and perhaps, in the process, turn aside fate.
(First version; will be revamped and re-written as much as needs be once it's finished. Desperately needs a beta-reader or two. There will also be pictures and whatnot later, once I get around to finishing them.)