In James Patterson's "The Angel Experiment," the quote "We'll, that's an evil smile..." hints at a moment of mischief or sinister intent by a character. The story revolves around a group of genetically engineered children, known as the Flock, who escape from captivity and face numerous dangers as they seek freedom and safety.

The quote captures the tense and unpredictable nature of the narrative, emphasizing the characters’ complex personalities and the threat they encounter. The story combines action, suspense, and themes of survival, making it an engaging read for fans of adventure and dystopian fiction.