The Sacrifice (The Enemy Book 4)

The sickness has struck everyone over fourteen.
First it twisted their minds.
Next it ravaged their bodies.
Now they roam the streets - crazed and hungry.

Against the odds, Small Sam has survived, but his sister is lost in the remains of London. To find her he'll do anything - even return to the Forbidden zone: the badlands where an unknown force is growing restless . . .