Imagine a designer walking into a complex project with a well-used toolbox. Inside are the methods that are known, trusted, and have seen work: journey maps, workshops, interviews, personas, prototypes, and systems maps. The toolbox is a mark of experience. But there is a subtle risk.

On World Book Day, we often celebrate books that transport us. Some, however, refuse comfort. They sit with us, unsettling, long after the final page. Regeneration by Pat Barker is one such text.