It's five years since Sandi Toksvig arrived on the South Bank in a speedboat to open Foyles at Royal Festival Hall.
To celebrate, the bookshop is offering 5 per cent discount on everything in store, plus a selection of paperbacks for Â£5 each and a chance to win five Â£55 gift cards.
On the lawn outside the shop there will be a series of special events.
12 noon: five-minute masterpieces from your favourite illustrators
1pm: Eithne Farry demonstrates five crafty things you can make for a fiver.
2pm: Laura Dockrill with five birthday poems