Harvey, a self-doubting private investigator, plans to marry his girlfriend until he is hired to solve an adultery case and discovers the adulterer is cheating with his fiancée. Lost and dejected, Harvey quits his job and wallows in booze and the occasional odd blind date. Meanwhile, Katia, a Jewish woman from St. Petersburg, arrives in Sydney after answering an ad from an international matchmaking agency. But instead of love, she finds her prospective groom dead on arrival.
The story begins when a young woman discovers a murder plot, and calls 911. But seconds into the call, she's attacked and abducted. The police investigation into the woman's disappearance leads them to interrogate the cast and crew of a play called 'The Russian Doll.' What the cops don't know is that like a Russian doll, one of the people they question is a killer hiding in plain sight, preparing to avenge a thirty-year-old crime by murdering a cast member on opening night. And what they also don't know is that if they don't act quickly, the kidnapped woman will die, too. Running throughout the movie is a subplot focused on the lead detective, Viola Ames. Viola's wife died two years earlier, and Viola has never really recovered. During her investigation, Viola meets a beautiful young lesbian named Faith. Despite her best efforts to maintain her distance, Viola is strongly attracted to Faith, and struggles to reconcile that attraction with her loyalty to her deceased wife.
Nadia keeps dying and reliving her 36th birthday party. She's trapped in a surreal time loop -- and staring down the barrel of her own mortality.