The Mammoth (The Mammoth #5)

Leaving the House of the Zombie behind, with the screams still echoing in the night, Jess and her undead girlfriend Olivia, along with Kokoro and Mason, speed through the forest on a path straight to the Mammoth, and the hardest decision Jess will ever face: stand up to the mammoth ghost of a creature that died eons before humanity ever walked this earth, or say goodbye to the woman she loves.