What is the name of J.K. Rowling’s crime-fiction detective who works with Robin Ellacott?

J.K. Rowling’s crime-fiction detective who works with Robin Ellacott is Cormoran Strike.

Cormoran Strike is the central investigator in Rowling’s crime novels published under the pseudonym Robert Galbraith. He is a private detective and former military investigator who operates in London. The first novel, The Cuckoo’s Calling, appeared in 2013 and begins the professional partnership between Strike and Robin Ellacott.

Robin initially joins Strike as a temporary secretary, but her organizational ability and investigative instincts make her an important collaborator. Their relationship develops across the series, although it is not simply a conventional detective-sidekick arrangement. Each novel presents a separate major case while also advancing their personal and professional story.

The series includes The Silkworm, Career of Evil, Lethal White, Troubled Blood, The Ink Black Heart, and The Running Grave. Television adaptations were produced as Strike, later titled C.B. Strike in some markets.