NETFLIX fans have been left “horrified” by harrowing documentary Tell Me Who I Am which tracks a set of twins’ abusive childhood and memory loss.

The feature-length documentary deals with the heartbreaking story of Alex Lewis, who lost his memory at the age of 18 after a motorcycling accident.

Alex relies on his twin brother Marcus, both now in their 50s, to teach him who he is and about their past, but Marcus chose not to tell him about their abusive childhood in a bid to protect his sibling from further trauma.

Eventually, the truth comes to light, and the twins have to confront the horrors of their past together, as well as the web of lies Marcus has created.

Alex obviously struggles to process the truth, and says in the documentary: “My life is not real. My life is the one you gave me.”

The boys, whose dad died in a car accident when they were three days old, grew up in Rudgwick, near Horsham.

The first act of the documentary is told from Alex’s perspective; he reveals that he lost his memory as the result of a motorbike accident when he was 18 years old. Waking up in hospital with no memory of what had happened, what came before or even recognising the woman standing by his bedside as his mother, the only person he did know was his twin brother Marcus.

Viewers took to Twitter to warn others that while it’s a fascinating documentary, it’s by no means an easy watch.

One wrote: “I was not mentally or emotionally prepared for Tell Me Who I Am on @netflix... the last 15 mins are a tough but important watch #tellmewhoiam #Netflix.”

Another added: “Tell me who I am. Netflix Unsettling and truly powerful.”

A third agreed, writing: “Just watched the new @NetflixUK documentary Tell me who I am WOW! How deeply disturbing! The strength these 2 have just by having each other is incredible! #Tellmewhoiam #Netflix.”

Meanwhile a fourth shared: “Oh my God. Has anyone else watched Tell Me Who I Am on Netflix? It’s a psych thriller but it’s REAL.

“I can’t quite believe what I am watching. Quite incredible. Horrific too. Those poor brothers.”

Director Ed Perkins said about the documentary: “It played out like a psychological thriller. And yet it was true. I was fascinated by the themes of brotherhood, the blurring of fact and fiction, memory and the question of who we are if we lose our memory.”

Alex previously told The Argus: “We are both married with children. You can move forward. These harrowing things can happen to you, but we’ve all got the opportunity to put that aside and live.”