|“||Remember that old story about Miss Kestrel, when she was thrown from her bicycle in a car accident? She knocked her head and stayed a kestrel for an entire week. That's when her loop slipped.||”|
–Miss Peregrine's Home for Peculiar Children, Enoch on Miss Kestrel
Miss Kestrel is mentioned once in Miss Peregrine's Home for Peculiar Children, when the group of peculiars think Miss Peregrine has changed into a peregrine and can't change back.
Ymeene finds Miss Kestrel, and the women both discover that the other can transform into a bird and can loop time. Miss Kestrel keeps Ymeene's loop going when she goes out on expeditions to find more ymbrynes.