Books in the Ruth & Freddy series

The cult favorite series from TidalWave together at last. Follow the high stakes adventures of rambunctous, wise-cracking grandparents Ruth and Freddy as they strive to understand why they've been brought back as zombies from the afterlife to save those they love from a global plague that threatens to engulf humanity when a cruel game of the Gods opens the gates of the underworld and the dead are unleashed upon the living to wreak havoc!