When the Closet Worked Its Magic - a long short story #665525

The closet swallowed his little sister. It really did. And yet, a year later, after it spat her back out, Elmer Warde must lie: I imagined it. I am insane.

This, after people suspected him of kidnapping his own sister.
And after they accused him of trying to murder her.

This is the ironic aftermath of a horror story that gets "solved": the loved ones of the missing person (now missing no more) face a fallout. Elmer's only hope of staying in touch with his little sister seems to be the insanity defense.

But must he settle for a sort-of-happy ending, or can he hope for a happy ending?