Every year hundreds of thousands of children see domestic abuse at home and it can happen to anyone.
Alesha Dixon tells her story to Newsround, along with children who have experienced it first-hand themselves.
We also see CBBC presenter Barney Harwood discover how widespread the problem is, when he spends time with a police unit responding to 999 calls.
Behind Closed Doors explores the rarely talked about issue of children witnessing domestic violence.