Half-Life — Tina Ferraro

High school sophomore Trisha Traynor and her friends have played the Halloween mirror game for years, the one that's supposed to show a glimpse of the guy they're supposed to marry. But no one's ever seen anything. Until tonight -- when Trisha is gobsmacked by the candlelit arrival of her long-deceased twin sister, instead of her crush, Kirk Maxwell.

In a voice and vision that only Trisha can hear and see, Chessie claims to be back on a compassionate journey. Trisha fears she's gone nuthouse crazy. Nonetheless she follows the instructions Chessie outlines in their nightly conversations, until she finds herself crossing some ethical lines, and probably ending all chances with Kirk.

When a sisterly showdown ensues, resulting in the shattering of the mirror, Chessie's gone again, and a heartsick Trisha sets about righting her recent wrongs. That is, until she stumbles upon the real reason Chessie came back, and the most important glimpse that the mirror could never predict.