Authors and illustrators will be signing copies of their books in exchange for a donation to the Friends of Guy's and St Thomas' Hospital.
Confirmed participants include David Barry, Coralie Bickford-Smith, William Boyd, Hugh Fraser, Brian Murphy, Gary Parsons, Linda Regan, Chris Riddell, Tony Ross, Brian Sibley, Paul Stewart, David Weeks and Jaz Zarifian.
All proceeds from the event will benefits patients of both hospitals.
Books will be for sale at the event via Hatchards of Piccadilly.
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