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.

The first meeting of the Fed since Donald Trump took office as president discussed the possibility of a rate rise as early as March.
Most economists have been forecasting a rise in June.
However, Fed officials appear divided on the timing of a rise amid uncertainty over Mr Trump's policies.
"Several'' expressed fears that unemployment could fall substantially below the Fed's 4.8% target. That could trigger inflation pressures and force the Fed to boost rates at a faster pace than financial markets expect.
Unemployment in December was 4.7%, although it was back at 4.8% in January.
Paul Ashworth, chief US economist at Capital Economics, said the "fairly soon"' phrase in the minutes "clearly leaves the door open to a March rate hike, although ... we still think the Fed will delay until June".
IHS Markit said the minutes and other recent comments signalled that a March rate hike was a "strong possibility".
If inflation and employment data for February were "in line with the recent trends", the Fed might "have no excuses to hold  off".
Ian Shepherdson, chief economist at Pantheon Macroeconomics, said the next increase was more likely to come in May than March unless there was a big increase in employment in February.
The minutes also showed that a couple of Fed officials had suggested the central bank might need to alter the wording of its policy statement.
The bank's assurances that it planned to raise rates at a "gradual" pace could be "misunderstood as a commitment of only one or two rate hikes per year", they argued.
The Fed left its key interest rate unchanged at the 31 January-1 February meeting.
In December it boosted its key rate by 0.25 percentage points to a new range of 0.5% to 0.75%.
The Fed had waited a full year to raise rates for a second time after its initial rate hike in December 2015.

The new company will take over Crown's 27.4% interest in two Macau businesses.
Macau is the world's largest gaming centre and the only place in China where casinos are allowed.
Its gaming revenues have been hurt by a slowdown in Chinese spending.
China's campaign against corruption and luxury spending began in late 2012 and has left officials and businesspeople from the mainland more wary of gaming and spending in Macau.
Crown said the demerger, which included a move away from interests in Las Vegas among others, would benefit shareholders.
Rob Rankin, chairman, said: "We believe that Crown Resorts' extremely high quality Australian resorts are not being fully valued and the Crown Resorts share price has been highly correlated to the performance of its investment in Macau."
Shares in Crown closed 13.2% higher at $12.75 in Sydney following the announcement, but were still flat over the past 12 months.
Crown was founded by James Packer, who stepped down as a director last December. He is the son of the late Australian media mogul Kerry Packer.
James Packer still owns a 53% stake in Crown and said last year that he planned to focus on projects in Sydney, Melbourne and Las Vegas, as well as Crown's online gambling operations.
Crown's first casino was in Melbourne and has since expanded to Sydney, Perth, London, Macau, Manila and Las Vegas.
Behind Closed Doors explores the rarely talked about issue of children witnessing domestic violence.
[NEXT_CONCEPT]
Federal Reserve officials have said they may need to raise interest rates "fairly soon" if the economy stays strong, minutes of their meeting show.
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A crackdown on corruption in China has prompted Australian casino operator Crown Resorts to spin off its international assets into a separate company.