It is a day like any other when Sarah arrives at the school gate to pick up her two stepchildren, Izzy and Patrick.

But when the twins don't run out to meet her like normal, Sarah knows something must be wrong.

Sarah can't believe what she's hearing when the teacher informs her that their father, Mike, removed them from school earlier in the day. All of Sarah's calls to Mike go to voicemail.

Worse is to come when Sarah is told by police that as she and Mike are not legally married, and he is the children's father, there is nothing they or Sarah can do.

Then she receives a text message from Mike: Don't go home. It's not safe.

What has Mike been hiding? Where are their children? How can Sarah get her family back? Before it's too late...