context: Nancy Drew (Emma Roberts) and her widowed father, Carson Drew (Tate Donovan), temporarily move from their quaint hometown River Heights to California, where Carson has a temporary job. Nancy's father also wants to use this time as a way to stop his daughter's sleuthing as he finds it to be dangerous, and encourage her to focus on high school and living like a normal teenager. But unbeknownst to Carson, Nancy chose their California house because its previous owner, Dehlia Draycott, was a movie star who disappeared for several months before being murdered during a house party and found in her pool. Nancy struggles to fit in at her new school, only befriending a younger boy, Corky (Josh Flitter). After discovering a letter that Draycott wrote to an unknown "Z", who was supposedly Draycott's lover, she realizes that the sleuthing world is the only place she fits in and decides to solve the mystery behind her dad's back. From photographs of Draycott during her last film, Nancy deduces that she had a baby and secretly gave it up for adoption. Nancy eventually finds Draycott's child, who turns out to be a young single mom named Jane Brighton (Rachael Leigh Cook), and who also turns out to be the sole beneficiary of Draycott's will, which has disappeared. Nancy receives a threatening phone call telling her to get off the case, and contacts her father's business associate, Dashiel Biedermeyer (Barry Bostwick), the lawyer of the Draycott estate, to assist her with the case.
  Meanwhile, as an early birthday present, Nancy's father presents her with the blue Nash Metropolitan convertible she left back at home in River Heights. Along with her roadster comes her long-time friend, Ned Nickerson (Max Thieriot). Ned understands her persistence in sleuthing and finds himself assisting Nancy with the Draycott mystery. Corky becomes jealous of Nancy and Ned's close relationship and tries his best to get Nancy's attention. At one point, a bomb is left in Nancy's roadster. Nancy manages to remove it and though she is knocked unconscious in the blast, she soon comes to consciousness. The trio spend numerous hours together, discovering an underground passageway to a neighbor's basement, which is rented by Leshing (Marshall Bell), the sketchy groundskeeper to the Draycott estate.
  One afternoon, a tearful Jane arrives on Nancy's doorstep and announces that her daughter has been taken away from her on false charges of child endangerment. She reveals that after Nancy's initial visit, a man showed up on her doorstep and threatened her. Nancy demands that her father take up Jane's case. He agrees as Jane stays with them. While watching a Dehlia Draycott film, Nancy realizes that Draycott must have hidden her revised will in a prop from one of her movies. She tracks the will to a Chinese antique shop, but just after retrieving it, Nancy is chloroformed into unconsciousness from behind and kidnapped by the villain's henchmen, and left in a locked room. Naturally, Nancy escapes, but gets into a car crash and must go to the emergency room. Her father, along with Biedermeyer, arrives and demands to know what is going on. She admits to her secret sleuthing and explains about Draycott's hidden will. Biedermeyer offers them a ride home so he can sign a lucrative business deal with Mr. Drew.
  Nancy discovers that Biedermeyer was Draycott's manager at the time of her death, would be disinherited by the appearance of a new will, and signs his papers with a large "Z," as his middle name is Zachary, and concludes that he is Dehlia Draycott's supposed love. However, when he questions Nancy about the will, she manages to jump out of the moving car, leaving her father with Biedermeyer and his men. Nancy manages to make it all the way home and is caught by Biedermeyer who threatens to "squeeze the will out of her." When Nancy asks him why he killed Dehlia, he replies that Dehlia went a little crazy after she put Jane up for adoption, and wanted to leave her career to be with her caretaker Leshing. He also reveals that Jane is actually Leshing's daughter, something that Leshing never knew about, and demands the will. Nancy kicks Biedermeyer in the shin and escapes, but is once again cornered by Biedermeyer and his henchmen. Leshing arrives via the secret passageway and knocks the henchmen unconscious with a shovel and Nancy reveals that she secretly recorded Biedermeyer's murder confession. While the police arrive to arrest Biedermeyer and his accomplices, Nancy reveals to Leshing that Jane's his daughter, which he in turn reveals to Jane, and which leads to them hugging for the first time. The will is restored to its rightful owner, Jane's able to get back her daughter and she ends up converting the Draycott mansion into a home for single mothers and their children as the Drews return to their home in River Heights.
  As Nancy watches a video sent by Jane and her new Draycott Home for Single Mothers, she's both happy and sad that the mystery's over. She goes outside to see Ned repairing her car, and they kiss. Afterwards, Mr. Drew comes out to tell Nancy that she has a long-distance phone call for a new mystery in Scotland (something involving the Loch Ness Monster and missing diamonds). She's just as cheerful as ever as she runs back into the house to learn of the new case.
question: Who is Nancy's father's business associate?
answer: Dashiel Biedermeyer (Barry Bostwick)