Patrick Ness, author of A Monster Calls offered to match up to £10,000 in donations to Save the Children for its refugee appeal.
Within two hours of posting on 3 September, £10,000 had been raised. Further money was match-funded as other writers came forward, with one person offering to make up the total to £200,000 if it reached £195,000.
The total now stands at more than £500,000 after match-fund donations from authors including Philip Pullman, Marion Keyes, Jojo Moyes, Jill Mansell and others.
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