Photo credit: Nathalie Gatineau
Diane Jeffrey
Agent: Kate Burke
Assistant: Siân Ellis-Martin
Biography: Diane Jeffrey is the USA Today bestselling and award-winning author of eight psychological thrillers.
She grew up in North Devon and Northern Ireland. She now lives in Lyon, France, with her husband and their three children, Labrador and cat.
THE GUILTY MOTHER, Diane's third book, was a USA Today bestseller and her fourth novel, THE SILENT FRIEND, was a Karin Slaughter Killer Reads pick for ASDA. Her fifth psychological thriller, THE COUPLE AT CAUSEWAY COTTAGE, won the 2023 International Thriller Writers award for the best ebook original novel. The French translation of THE OTHER COUPLE (Écarts de Conduite) won the 2025 Noir sur Ormesson prize for best thriller.
Diane is an English teacher. When she's not working or writing, she likes swimming, running and reading. She loves chocolate, beer and holidays. Above all, she enjoys spending time with her family and friends.
Follow Diane on Instagram or Facebook.
Contact her or sign up to her newsletter via her website.
THE CRIME WRITER
Psychological thriller, 304 pages, HQ Digital, March 2025
2019. 34 year-old Leona Walsh vanishes on a bitter afternoon while jogging on Exmoor. It’s a mystery which captures public interest and ignites wild speculation. The police have a prime suspect: Leona’s husband, Matthew, a renowned crime writer. He can plot the perfect crime. But is he capable of committing the perfect murder?
Despite extensive searches, the police find no trace of Leona. As public interest dwindles, Matthew returns to raising their daughters, aware the cloud of suspicion is never far away.
2024. Some human bones are discovered in a garden. Could they be Leona’s remains? And if so, is there enough evidence to find out what really happened five years ago?
Journalist Gabriela Conti covered the news story back in 2019. The police may have stopped watching Matthew, but Gabriela hasn’t forgotten him. And she is determined this case will define her career… even if that means getting close to a murderer.
THE OTHER COUPLE
Psychological thriller, 320 pages, HQ Digital, June 2023
Kirsten and Nick are enjoying a weekend away until, on their drive home, they accidentally run over and kill a man. They should call for help – but they have too much to lose, and no one can know the real reason they’re here. Instead, they make a split-second decision to conceal the accident.
Amy and Greg have just celebrated their tenth wedding anniversary. Amy is expecting a baby, and they couldn’t be happier. So when Greg fails to come home from a dog walk one weekend, Amy knows the police are wrong to believe he left of his own accord. Someone must be behind Greg’s disappearance, and Amy won’t give up until she gets justice – or revenge.
If you had nothing left to lose, how far would you go to find the truth?
THE COUPLE AT CAUSEWAY COTTAGE
Psychological thriller, 352 pages, HQ Digital, August 2022
Kat and Mark move to an island off the Northern Irish coast for a new beginning. Far away from their frantic life in London, it’s the perfect place to bring up the family they’re longing to start.
But as soon as they arrive, cracks begin to appear in their marriage. Mark is still texting his ex-wife. Kat is lying about a new friendship. And one of them is keeping an explosive secret about the past.
The couple in Causeway Cottage are hiding something – and the truth can be deadly…
THE SILENT FRIEND
Psychological thriller, 352 pages, HQ Digital, December 2021
It’s supposed to be Laura’s dream holiday: a trip to France with a group of friends to see their favourite band play live. But the holiday quickly turns to disaster, and Laura is left haunted by terrifying images from the worst night of her life.
When Laura finds an online support group for victims like her, she’s not convinced it will help. But then Sandrine replies to her message, and she seems to understand what Laura’s going through, in a way that no one else can.
Soon, Laura and Sandrine are sharing their deepest thoughts and feelings with each other. But one of them has a terrible secret – she isn’t who she says she is. And once the twisted truth is revealed, there’s no going back…