"Pikachu is a detective. Detectives investigate crimes. Forensic anything is, by definition, about investigating crimes. Boom, easy." She smiled as she sipped her coffee. "You're lucky to assist Pikachu in his noble purpose."
Other options:
no subject
"Pikachu is a detective. Detectives investigate crimes. Forensic anything is, by definition, about investigating crimes. Boom, easy." She smiled as she sipped her coffee. "You're lucky to assist Pikachu in his noble purpose."