How would you survive being abducted and trapped underground?

Former soldier Ryan Granger's life has become all about numbers:

13 months since he was shot in the head

7 months spent in a coma

6 months since he woke, a changed man

5 hours since he'd been kidnapped

4 minutes since he'd opened his eyes in an underground cavern

3 minutes since he'd heard a woman moaning in pain...

Two strangers trapped together.

One impossible way out.

And zero chance his team isn't ripping

the world apart to find him.

Ryan and Sarah don't know who put them there or why.

All they know is that they have to work together to survive.