Is her child really missing? Or did he never really exist?
After a difficult few months, Karina's looking forward to a short break in Turkey with her husband and four-year-old son, Jacob.
The marriage has been showing signs of strain lately, so it'll be a chance to relax, enjoy some good food, and more importantly, reconnect with the people she loves the most.
But on their first morning, Karina is startled to discover she's slept in late.
Where's Jacob?
He's usually an early riser who likes to tumble into their bed first thing, pestering them to make him breakfast.
A needle of fear spikes through Karina's veins.
She rushes to his room, but his bed is empty and he's nowhere to be found in the villa. Frantic with worry, she raises the alarm with her husband â but he stares at her blankly, like she's out of her mind.
He says he has no idea what she's talking about. They don't have any children, and he's never heard of a boy called JacobâŚ