Thawed

It's been almost 3 months since Anna saved the summer, since Elsa realized love could thaw, and of course, since Kristoff and Anna kissed. Things have been slow and steady for the two lovebirds, but now that Kristoff is moving into the castle, Anna has a feeling something wonderful and new is on the horizon.
But when Anna learns about Kristoff's dark past, she soon realizes they could all be in grave danger.
Can Kristoff, Anna, and Elsa stop the winter a second time around?