Keeley Hawes has revealed she read Kate McCann's book about her daughter Madeleine to help her prepare to play the mother of an abducted girl.
The Line Of Duty actress - a mum of three in real life - stars in the second series of The Missing, playing a woman whose daughter is discovered alive years after she vanished.
Keeley, 40, told the Mirror: "I read the book Kate McCann wrote about Madeleine going missing.
"It was fascinating and I just think it unbelievable she was able to (write it).
"But I imagine it must have been quite cathartic, in a way.
"It doesn't make for comfortable reading but then the story isn't comfortable."
She said her "heart goes out" to Mrs McCann.
Keeley admitted the role has been a challenge and that, as a mother, she used to avoid television shows about children being snatched.
"I probably did it now as the kids are older and it was really challenging and I do like a challenge," she said.