The 30-year-old woman, named by The Sun newspaper as Rosie, begged for help in the letters but warned the recipient not to confront her "mad and evil" captors.
An Indian man, who police said on Monday was 73 and not 67 as previously thought, and a 67-year-old Tanzanian woman have been arrested and bailed over the case.
Police have said that the two older women -- a 57-year-old Irish woman and a Malaysian aged 69 -- met the male suspect in the 1970s through a "shared political ideology" and that at one point they had lived together in what officers described as a "collective".
She pleaded for help, but also urged him not to try to help her and said: "These monsters here are mad and evil and racist."
The report said she had become infatuated with Feneck and described his girlfriend, who lived with him in the same block of flats in Brixton in south London, as "vermin".
Detectives have said that although they do not believe the three women were subjected to sexual abuse, they were kept in "invisible handcuffs" through psychological terror.
London's Metropolitan Police said it had no comment on the reports.
Home Secretary Theresa May said on yesterday that tackling modern slavery in Britain was a "personal priority" and that other victims were "hidden in plain sight".
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
