Summer is almost over and Mattie and the gang have time for one last hurrah before getting back to work. They pile into cars and drive up the coast for a weekend getaway in a private winery, ready for drinking, laughing, and relaxation. Because if they don't deserve the break, then who does?

But where Matilda Kavanagh goes, trouble is not far behind.

Wyvern Wineries is nothing like the picturesque brochures promise. The land is dead, their only means of escape cut off, and there is something inside the house, hunting them. As their companions start to disappear and the violence grows, can Mattie and her friends figure out what's really going on before it's too late?