The Poison Tree, a two-part British psychological thriller miniseries that aired on ITV in December 2012, remains a haunting adaptation of Erin Kelly’s acclaimed debut novel. Directed by Marek Losey and scripted by Emilia di Girolamo, it masterfully blends past and present to unravel a web of secrets, obsession, and murder.

Trailer
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The Poison Tree - Apple TV
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The story centers on Karen Clarke (MyAnna Buring), a devoted mother welcoming her partner Rex (Matthew Goode) home after his 12-year prison sentence for murder. As they rebuild their life with daughter Alice in a remote seaside cottage, flashbacks reveal the truth: years earlier, strait-laced student Karen was drawn into the bohemian world of Rex and his charismatic, reckless sister Biba (Ophelia Lovibond). A summer of love in their crumbling family mansion turns deadly when hidden lies and violence erupt, forcing Karen to extreme lengths to protect her secrets.

The Poison Tree (TV Mini Series 2012) - IMDb
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The Poison Tree (TV Mini Series 2012) – IMDb

Buring delivers a nuanced performance as the tormented Karen, torn between guilt and survival, while Goode exudes brooding charm as Rex. Lovibond steals scenes as the manipulative Biba, whose narcissism leaves destruction in her wake. The nonlinear narrative builds suspense through blackmail threats and revelations, culminating in a dark twist.

Critics praised the atmospheric tension and strong acting, with The Guardian noting its compelling psychological depth. Though some found the pacing uneven, IMDb users highlight its “dark, haunting” quality and faithful book adaptation. At just two episodes, it’s a tight, bingeable thriller exploring themes of deception and loyalty.

Available on platforms like Acorn TV and Prime Video, The Poison Tree endures as underrated British TV—perfect for fans of twisted family dramas.