The Women in Cabin 10

 Keira Knightley as Laura "Lo" Blacklock and Guy Pearce as Richard Bullmer in this thriller. The last time we saw Keira on a boat was in Pirates of the Caribeean alongside with Jack Sparrow aka J. Depp. Recovering from the trauma of witnessing a source's murder, investigative journalist Laura "Lo" Blacklock receives an invitation from terminally ill billionaire Anne Bullmer. She joins her and her husband Richard, as well as their wealthy guests, aboard their luxury superyacht sailing to a fundraising gala in Norway, to write about the Bullmers' new charitable foundation.

The first evening at sea, Lo ducks into Cabin 10 to avoid her ex-boyfriend Ben, a photographer working for the Bullmers, encountering a mysterious blonde woman there. After dinner, Anne privately reveals to Lo that she has stopped taking her medication, and gives her a copy of the speech she plans to make at the gala to announce she is donating her fortune.

That night, waking to a woman's scream, Lo finds a bloody handprint by Cabin 10 and witnesses someone fall overboard. We actually hear, but we don´t knwow if she is imagining in her head. She alerts the ship, but all passengers are accounted for; no guest is staying in Cabin 10, and the handprint has disappeared. Unnerved, Lo investigates.

The voyage continues, and Anne appears to forget her earlier conversation with Lo, blaming her medication. Lo spots the blonde woman from Ben's photographs of a party attended by fellow passenger Adam, who claims not to remember her. At the spa, someone writes "STOP" on Lo's steamy shower door. Adam is nearby but denies writing it, and Lo learns the ship's security cameras are deactivated for privacy. Sneaking into Cabin 10, Lo finds blonde hair in the sink drain and hides the evidence in her own cabin. She confides in Ben, but suspects her room has been searched after finding a button on the floor.

Lo is pushed off the upper deck into the pool and nearly drowns. The hair and button disappear when her coat is laundered, and she notices Anne's doctor, Robert Mehta, is missing a button. The crew are unwilling to answer Lo's questions, and the irritated guests refuse to believe her suspicions. Barricading herself in her room, Lo spots the woman from Cabin 10 in the hall and follows her to the engine room. Begging Lo to drop her investigation, the woman knocks her unconscious and hides her in a storage room.

Lo realizes that Richard would be disinherited, so had arranged for a lookalike to assume Anne's identity. Carrie, the woman from Cabin 10, confesses that Richard hired her to impersonate Anne so as to sign over her fortune to him. After privately talking to Lo on the first evening, Anne discovered Richard kissing Carrie, so he killed her, then dumped her body overboard. Carrie desperately needs the promised money to help her family, but Lo warns that Richard will kill her after she signs Anne's revised will.

Carrie overhears Richard order Dr. Mehta to find and kill Lo, and Ben returns to the ship as the other guests disembark in Norway. Cornered by Mehta and the ship's complicit captain, Lo is saved by Ben, who is jabbed with a lethal injection. She jumps overboard and swims to shore, while Mehta assures Richard that she could not have survived the freezing waters. Posing as Anne, Carrie reluctantly signs the new will, surprising Anne's legal counsel and drawing suspicion from Anne's bodyguard, Sigrid Nilssen. Richard prepares to have Carrie killed, while Lo explains Anne's murder to Nilssen and offers to prove Richard's guilt.

Lo interrupts Richard in front of the entire gala and, with Carrie's encouragement, reads Anne's speech revealing Richard was to be cut off from her money. In desperation, he declares that Carrie is not Anne and takes her hostage at knifepoint, fleeing to the dock. Nilssen retrieves a rifle and wounds Richard in the shoulder, and Lo kills him with a nearby crank before he can kill Carrie.

Lo publishes her exposé on Richard's crimes, leading Mehta and the captain to be arrested for the murders of Ben and Anne, while Carrie returns home to her daughter.

It is a good thriller, but it doesn´t innovate.