It never fails to astound me how one person, reading all the time, can still be so very very far behind. I should have read this ages ago.
From the Blurb:
At seventeen, Jodie Cramer survived a terrifying assault at the hands of three strangers. Her schoolmate Angie was not so lucky ...
Now thirty-five, Jodie is a teacher and mother of two - and her past is a horror she's buried deep. When she sets out for a weekend in the country with three friends, all she has in mind are a few laughs and a break from routine.