Summary
One last mystery holds the key to saving the world, and Grace must choose how she spends her final days.
Guest stars
Craig Marsh,
Gwenda Lorenzetti,
James Lesure,
Joan Gregson,
John Noble,
Lee Shan Gibson,
Luke Arnold,
Patrick Sparling,
Rachel Drance,
Samantha Ferris,
Sarah Edmondson,
Willie Garson,
Yvette Lu