They thought their biggest battle had been fought - but the war had not even begun. Months after the defeat of a vicious army that threatened their very existence, a new enemy has come to town. For Mike and his family, it’s a race against time. With death lurking around every corner, their only hope is to enter a zombie infested city to find the one thing that might save them. They have fought for all they have, but is this one battle too many?

The residents of Safe Haven had fought the living, the dead, and the worst winter in decades. They had earned their time of peace. They had earned their dream of happiness. But now...now, it’s all gone to hell. For Mike, Emma, Lucy, and Wren, their most treacherous journey has just begun. They’ll enter a place darker than night itself and confront an enemy more sinister than any they have ever encountered.

The planet has succumbed to a monstrous virus. Those who die from the infection return as savage zombies hell-bent on spreading the virus to the rest of the human population. The UK and Ireland are the last hold-outs, but when the infrastructure supporting their self-imposed quarantine collapses, it's everyone for themselves. Mike Fletcher and his sister Emma live in Leeds. With the city's streets overrun by the dead, their only option is to flee. They take their younger siblings and set off to find their last remaining relative in the far north-west of Scotland.

They escaped the cities. They lived through the storm. But there are more dark clouds forming on the horizon for Wren and Robyn. The undead have made escape impossible. Ruthless gangs patrol the highways, and danger lurks in the shadows. A new friend and a new settlement and things are looking up, though all is not what it seems.

Before the worst day of their lives, wild horses could not pull them together. Now, nothing can tear them apart...or so they thought. A chance meeting, a bad decision, a stormy night - the fuse is lit to their most explosive 24 hours yet. When the dead roam the streets, when enemies prowl in the shadows, and when strangers are not all they seem, the only people Wren and Robyn can rely on are each other.