Eeny meeny

The girl emerged from the woods. Traumatised and emaciated; close to death, but alive.

Her story seemed too terrible to be true. But it was. Every dreadful word of it. When, days later, another desperate survivor is found, a pattern becomes clear.

Pairs of victims are being abducted, imprisoned then forced to make a terrible choice.

Which would you sacrifice - your life or your conscience?

For DI Helen Grace there is now an unseen killer to be hunted down.