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Born in Folkestone, Kent, England, in April 1947, Picknett grew up in an alleged haunted house in York, attending Park Grove Junior School and Queen Anne Grammar School. After graduating from university with an Upper 2nd (hons) degree in English Literature, she briefly became a teacher, a shop assistant, and a stand-up comic before moving to London in 1971 to join Marshall Cavendish Publications as a trainee sub-editor.
In the 1980s, she was Deputy Editor on The Unexplained and contributor to many other publications. She was also a regular contributor on various radio shows, including Michael van Straten and Clive Bull's on LBC and Talk Radio. She was also a television presenter for both Anglia and Southern TV.
In 1990 she was guest curator for the Royal Photographic Society's exhibition The Unexplained at Bath, performing the same function in 1999 for the National Museum of Photography, Film and Television at Bradford.
In the early 1990s, she teamed up with fellow researcher and writer Clive Prince. Their first book, Turin Shroud: How Leonardo da Vinci Fooled History, was the first mainstream work to reveal how all the so-called miraculous characteristics of the Turin Shroud could easily be reproduced only using a pinhole camera (camera obscura), and argued that Leonardo da Vinci not only faked it, but used his own face for the model of Jesus.
Between 1999 and his death in 2003, she and Clive Prince worked with Stephen Prior, described in book blurb as "a historian specialising in intelligence matters".
Picknett and Prince perform most of the research for their books themselves, though they are sometimes helped by several friends and fellow researchers. They have credited Keith Prince as a main contributor for their work on the Turin Shroud, Philip Coppens in The Stargate Conspiracy (published in 1999), and Robert Brydon for their work on Rudolf Hess (titled Double Standards: The Rudolf Hess Cover-Up and published in 2001).
Picknett, as well as Prince, makes a brief appearance in the film The Da Vinci Code. The pair appear on a London bus as the protagonists are travelling to the Temple Church, off Fleet Street in central London. Robert Langdon (Tom Hanks) leaves his seat to join Sophie (Audrey Tautou) at the back of the bus, and Picknett and Prince are seen sitting on the left.
She is the co-author of:
- Turin Shroud: In Whose Image? the Truth Behind the Centuries-Long Conspiracy of Silence (with Clive Prince)
- The Templar Revelation (with Clive Prince)
- Stargate Conspiracy: The Truth about Extraterrestrial Life and the Mysteries of Ancient Egypt (with Clive Prince)
- Double Standards: The Rudolf Hess Cover-Up (with Clive Prince and Stephen Prior)
- War of the Windsors: A Century of Unconstitutional Monarchy (with Clive Prince and Stephen Prior)
- Encyclopedia of Dreams
- Friendly Fire (2004) (with Clive Prince and Stephen Prior)
- The Sion Revelation (2006) (with Clive Prince)
- The Masks of Christ: Behind the Lies and Cover-ups About the Man Believed to Be God (2008) (with Clive Prince)
- The Forbidden Universe (2011) (with Clive Prince)
She is the author of:
- The Loch Ness Monster (Pitkin Guides)
- Royal Romance an Illustrated History of the Royal Love Affairs
- Mary Magdalene: Christianity's Hidden Goddess
- The Secret History of Lucifer
- Mammoth Book of UFOs
- Flights of Fancy? 100 Years of Paranormal Experiences