The Black Casket Legacy: Darkest Frost by B Hughes-Millman

A deteriorating shed in the deep woods surrounding Eastbend hides more than just a small black casket. The dangerous secret of more than a decade ago unravels as 5 curious kids learn what really happened to the people who've gone missing from their town. In a frozen forest, an icy path is not as harmless as it seems. Becca, David and Lyn have to solve the mystery and find the key to returning to the town they have grown to despise before they all freeze to death from the inside out.