The Enigma Girl.

"The Enigma Girl" by Henry Porter, as reviewed in Publishers Weekly, follows MI5 agent Slim Parsons as she navigates a spy story filled with danger and intrigue. Facing disgrace and seeking retirement, Parsons is pulled back into undercover work to investigate an online news operation exposing corruption. While Parsons is a compelling protagonist, the story's action is slowed by numerous subplots. Overall, the novel presents a mix of suspense and character development, though some may find the pacing lacking. [Extracted from the article]