Nicola Slater has illustrated The Pumpkin Thief, the latest instalment in the New York Times bestselling Leaf Thief series, written by Alice Hemming and published by Scholastic (10 September 2026). The 32-page Halloween picture book for children aged 4 to 8 reunites Squirrel and Bird for an autumnal mystery, as Bird's pumpkins begin vanishing from the garden one by one.