A 22-year-old woman who had been working aboard a yacht in Nantucket says what began as an uncomfortable dinner with her employer ended in a terrifying alleged sexual assault.

Christian Bradley Williams, 54, of Florida, has been charged with three counts of rape and indecent assault and battery after the woman told police he drugged and assaulted her aboard his yacht, the Chimera, in Nantucket Harbor.

Williams has pleaded not guilty.

According to a police report cited by the Nantucket Current and the New York Post, the alleged assault happened on August 9 — just hours after Williams’ wife, young son and nanny had left the island and returned to Florida.

The woman had begun working as a deckhand on the yacht in June.

In exchange, she was allowed to live aboard the vessel while also working another job on Nantucket.

That arrangement, she told police, suddenly became frightening on the afternoon of August 9.

At around 4:15 p.m., Williams allegedly asked her to put on a dress because he wanted to take her somewhere nice.

When he saw her dressed, she said, he complimented her appearance.

That was when she first began feeling that something was wrong.

The situation allegedly became increasingly uncomfortable over dinner.

According to the police report, Williams made repeated personal comments, including remarks about her appearance and her boyfriend.

He also allegedly told her he did not want his wife to know they had gone to dinner together.

At one point, the woman said she became nervous enough to tell him directly that she wanted to return to the boat.

But before they left, Williams allegedly asked her to put the restaurant bill on her own card so that the transaction would not appear on his account.

He then withdrew $500 in cash and gave it to her, despite the bill reportedly being around $250.

The woman said she refused his suggestion to continue the night with another drink and again insisted on going back to the yacht.

Once they returned, she told police she planned to go to bed.

Williams allegedly kept pushing for one final drink.

According to the police report, he prepared a rum beverage.

The woman said she had consumed only limited alcohol earlier that day.

After drinking the rum, she told investigators, something changed rapidly.

She became extremely dizzy.

Her vision began to fade.

Then, according to her account, Williams was suddenly on top of her.

She told police that she pleaded with him to stop, reminding him that she was his employee.

“I’m your employee, please get off me,” she recalled saying.

She alleged that he held her down and sexually assaulted her.

The woman told investigators that Williams then moved her to his bed, where she lost consciousness almost immediately.

When she woke up, she said she noticed signs on her body that made her believe she had been assaulted.

She left the yacht.

What happened next is detailed in the police report and adds another disturbing layer to the case.

The woman called Max Shapiro, the owner of the Nantucket Launch Company, where she was separately employed.

Shapiro had reportedly helped connect her with the housing-and-deckhand arrangement aboard Williams’ boat.

When they met, the woman said she told him she had awakened “naked and bleeding” in Williams’ bed.

She alleged that his initial reaction was dismissive and that he questioned whether she was working.

Shapiro strongly disputes that description.

“The recap of the conversation on the dock is not at all accurate,” he later said in a statement, adding that the company is cooperating with police and does not want to interfere with the investigation.

The woman ultimately quit her job.

She then called her father while crying and told him that “something bad” had happened aboard the boat.

From there, she went to Nantucket Cottage Hospital and underwent a sexual assault examination.

Weeks later, according to the police report, forensic testing returned positive for male DNA.

The publicly reported information does not by itself establish whose DNA it was or what conclusions prosecutors will ultimately be able to draw from it.

Williams was later arrested.

He was charged with multiple counts related to the alleged attack and appeared in court, where he pleaded not guilty.

The judge set bail at $50,000 cash or $500,000 surety.

His attorney later indicated that Williams expected to post bail.

Williams has ties to the U.S. Navy and has previously been identified in public posts as a former commander of the USS Springfield submarine.

Those details have added another layer of attention to a case already attracting intense scrutiny on Nantucket.

But the core of the case remains the account of a young employee who says she relied on the yacht for housing — and then found herself in a situation she says turned from uncomfortable to terrifying within hours.

Prosecutors will now have to prove those allegations in court.

Williams is entitled to the presumption of innocence unless and until proven guilty.

For the woman at the center of the case, however, the night has already become something far more personal than a legal proceeding.

She says she boarded the yacht as an employee.

Hours later, she says, she fled it believing she had been assaulted.