She gave you everything. But what does she want in return? When Lizzies daughter Meg is given a life-saving heart transplant, Lizzie feels hugely grateful to the nameless donor. Then she receives a letter from the donors mother, Karen, asking to meet, and it seems like the least she can do. But as soon as Karen is welcomed into their lives, Lizzie feels something isnt right. And before long, she cant help but worry that by inviting Karen in, she might have put Meg in danger . . .