Tom Grater International Film ReporterJess Ryder’s psychological thriller novel The Ex-Wife is getting the series treatment, with Euro outfits BlackBox Multimedia and Night Train Media teaming for an international co-production.New York Times bestselling author and actress Catherine Steadman, known for roles in Downton Abbey and her novels including Something In The Water, has been drafted in to pen the screenplay, her screenwriting debut.The Ex-Wife follows newlywed Tasha, who has the perfect