Identical 9-year-olds from very different backgrounds: orphaned Amanda and wealthy Alyssa meet at summer camp and decide to switch places -- and play matchmaker between Alyssa's dad, Roger, and the kind social worker who cares for Amanda.

After a shady art collector is murdered, adept Dr. Sebastian Ott uncovers a massive organised fraud with fake paintings. His twin brother Ludwig is responsible, kidnaps him and locks him away in his house. He uses Otto's ID and 'replaces' him...

The lives of twin brothers Annadurai and Thambidurai change radically following a murder that the former commits. How does he ensure that his sibling regains his old life?

Cultured Mario and outlaw Lucien, twins separated at birth, join forces to avenge their parents' death at the hands of evil Colonna. Because each feels all the same sensations experienced by the other, swordplay is difficult for them. Worse yet, raised very differently, they struggle to find common ground between their conflicting personalities. But to defeat their enemy, the two will have to overcome the obstacles and work as a team.

A greedy man gets a job in politics thanks to his connections - and abandons one of his two children to pursue his fortune. Many years later, his abandoned son impersonates his twin brother, who has fled the country.

Tuuli grows up in an oppressively religious and abusive family in Finland. To escape from the shadow of her angelic twin sister she travels to Melbourne, Australia. Curious of sexuality, she becomes a nude model for art classes. Her innocent surface reveals sordid cracks as she sets about exerting her twisted version of righteousness.

The father of twin brothers wants to get them married to only twin sisters. But one of the brothers falls in love with a woman does not have a twin sister.

Identical twin brothers become hybrid A.I (artificial intelligence) entities, yet torn in different directions to achieve justice for humanity.

Gabriel and Iris head back to their family holiday home in Portugal with their daughters Emma and Zoé, a couple of adorable six-year-old twins, for a vacation. In the heart of the sun-drenched countryside, as the little ones swim and laugh, the couple’s past begins to rear its head. Emma is overwhelmed by a secret that is simply too big for her to keep, and which she has no right to share with her twin sister.

Guru and Raja are twin brothers. Guru is set to marry a collector. On the day of the marriage, Raja is kidnapped and shown a photo where he is stabbing a girl. Raja realises it is Guru in the photo. What transpires later forms the crux of the story

Singleton Kartar Singh is left with the responsibility of raising his two orphaned nephews. He asks his brother in Punjab to raise Charan and his sister in London to raise Karan. When the twins cross continents, they leave behind a trail of confusion.

One suspects writer-director Carol Lai may have harboured some Black Swan ambitions with a tale that also centers around a stage practitioner who embarks on an unwitting destructive journey when playing a role to die for. The Second Woman, whose Chinese title Romance Riddle may hold better clues as to how this film developed, being more of a guessing game that threw constant clues rather than a overly romantic film about twins falling in love with a man who decided it's perfectly OK to string both women along, until he discovers that this spells double trouble.