Legend of the Rainbow Eater

Sometimes the end of the rainbow...is the belly of a beast.
When the Blackouts' search for the legendary Wishing Mist leads them to a maple syrup festival in the town of Mapleton, sticky situations abound. Bodies are going missing from the local funeral parlor, hellhound gypsies prowl the woods, giant, automaton teddy bears may or may not be staging a hostile takeover, and there's a whopping good chance that will-o'-the-wisps, the magical inhabitants of the Wishing Mist, are behind it all.
Even with help from their future selves and a time traveling diary, Rose and Marek have their hands full (and not just with ice cream cones from a parlor that services the living as well as the dead). The will-o'-the-wisps were responsible for bringing them together five years ago, and now it looks like the only way to stop their mischief is to find the Wishing Mist and wish it out of existence--will-o'-the-wisps included.
Some thank-you for the greatest friendship in the multiverse, huh?