The Mammoth (The Mammoth #2)

Road trip with a dead friend! Olivia is dead. But Olivia is back. And she wants to go somewhere? But... where? In the vast forest of Broke Tree Valley, something supernatural is waiting. Something monstrous. Something mammoth. Only a car full of fools would drive into the fog and mystery of those deep dark forests, or toward the deeper darker lake, but that's just what Jess and the others are doing, only to find that the eerie secrets at the bottom of the waters are about to surface.