Sophie was born and brought up in London, where she still lives with her teenage son. She has worked as a journalist and a magazine editor, but fell in love with writing after being made redundant and enrolling in a creative writing course. She burst onto the publishing scene with Girl, Missing, her debut novel (2006), which tallied up numerous award wins nationwide, including the Richard and Judy Best Kids' Books 2007 (12+ category), a Red House Book Award (in category) and The Manchester Children's Book Award. She was also longlisted for the Branford Boase award, which commends first-time authors, and the coveted Carnegie Medal.
Following her exceptional debut, Sophie published the Luke and Eve trilogy, comprising Six Steps to a Girl (2007), Three's a Crowd (2008), and The One and Only (2009). A return to thriller-writing saw publication of Blood Ties in 2008, another multiple award winner which again saw Sophie longlisted for the Carnegie Medal, and crowned winner of the North East Teen Book Award and the overall Red House Book Award among many others. Blood Ransom, the sensational follow-up to Blood Ties, was published in 2010.
The Medusa Project series was launched in July 2009, following the thrilling, fast-paced story of four teenagers impregnated with the Medusa gene, which manifests itself in various psychic abilities. The series comprises The Set-Up, The Hostage, The Rescue, Hunted, Double-cross and Hit Squad (January 2012). A special short story, The Thief, was published for World Book Day in 2010.
Aside from these Simon & Schuster titles, Sophie has also published The Fix (Barrington Stoke), Time Train to the Blitz (Usborne), Author's Sword (A&C Black), and contributed to Losing It (Andersen Press) alongside the likes of Melvin Burgess, Keith Gray, Jenny Valentine and Patrick Ness.