A Mother's Son. 9:00pm, ITV1.
(1/2) When it's on top of its game, ITV1 is so good at these enthralling two-part psychological thrillers and A Mother's Son is a belter. Hermione Norris is Rosie, mistress of a deli in a charming Suffolk seaside town, chatelaine of the most beautiful house and new wife of widower Ben (Martin Clunes). Between them Ben and Rosie have four teenage kids and everyone is trying to settle into their new lives.
But it looks like this domestic idyll could be ruptured for ever when a schoolgirl is murdered and a terrible suspicion bubbles up in Rosie, one that, however hard she tries, she cannot dismiss.
Chris Lang's taut script is brilliantly adept at leading us in many different directions as, thanks to Norris's febrile performance, we feel every single pinprick of bafflement, fear and disbelief. We wonder just how far she will go to protect those she loves the most. Alison Graham
A Mother's Son concludes tomorrow.