When foster carer Maggie Hartley meets Sean and Sheila, they're facing every parent's worst nightmare. A split-second decision to leave toddler Edward alone for a few short minutes results in a tragic accident, and Edward is left fighting for his life. He survives, but is tragically left severely brain damaged. Wracked with guilt, destroyed by blame and struggling to accept that their perfect toddler has gone, Sean and Sheila go to pieces. Maggie steps in to foster Edward while his parents battle with the unspoken fear that he may have to be adopted permanently if they cannot cope with their son's needs. Will Maggie be able to help this family grieve for the son they've lost and learn to love the little boy he is now? And will Edward have a family to go home to at Christmas?