Doctor Foster (Seasons 1–3)

Doctor Foster (2015) is a British drama series you can watch online on iFILM. Gemma Foster is a respected small-town GP with a husband, a son and a life that runs like clockwork — until she finds a stray blonde hair on her husband's scarf.

From there everything comes apart fast. Gemma (Suranne Jones) starts watching, checking, piecing things together, and learns the betrayal runs far deeper than a simple affair. The calm, trusted doctor the whole town relies on turns into a relentless investigator of her own marriage, and the lies of her husband Simon (Bertie Carvel) drag neighbours, friends and patients into the spiral. A young Jodie Comer, well before Killing Eve, plays the woman at the centre of it.

Created by playwright Mike Bartlett, the first series broke ratings for BBC One and grips you not with a "who" but with the question of how far Gemma will actually go. It's perfect for anyone who loves cold revenge and psychological warfare without a single gunshot. Stream Doctor Foster (2015) online on iFILM.