Open auditions are being held to find a child to appear in the film adaptation of the novel, the Guernsey Literary And Potato Peel Pie Society.
Filmmakers are looking for a girl from Guernsey to play the part of Kit, who is aged between four and six.
The character is the adopted child of Juliet Ashton, who will be played by Kate Winslet.
The open auditions are due to be held on Saturday at St. Sampson’s High School between 09:00 and 14:30 GMT.
Last week it was confirmed some of the scenes would be filmed in Guernsey.
Theater schools in the island have been approached to put forward girls for private auditions on Friday.
Kelly Valentine Hendry, who is responsible for the casting, said they were looking for a natural and previous experience of acting was not necessary.
She said there was no need to book for the open casting, that only one parent could attend per child and those girls attending should take along a small box containing three items they particularly like or find interesting to talk about.
Source: BBC News