Anna Trewin is the pen name of Sorrel Pitts, an English educational writer, editor and novelist. As "Anna Trewin", Sorrel has written numerous educational adaptations including Ian McEwan's The Children Act, Richard Osman's The Thursday Murder Club, John Le Carré's The Night Manager, and Mario Puzo's The Godfather, which won the international Language Learner Literature Award. Sorrel's debut novel The River Woman was published in September 2011 by Indigo Dreams Publishing. In February 2024, Sorrel's latest novel Broken Shadows was published by Bloodhound Books.