Isabella sat at a corner table, her fingers tracing the edges of a well-worn book on forensic science. Her eyes occasionally flicked up, catching glimpses of students passing by, unaware of the obsession brewing just a few tables away. Dexter watched her intently, his mind a whirlwind of thoughts as he wondered how best to capture her attention.

Isabella sat cross-legged on her bed, her laptop glowing softly as she scrolled through online listings for forensic internships. Her heart skipped a beat when she found a promising opportunity at the local police department. "This could be my chance," she murmured to herself, excitement bubbling within her.

Isabella worked diligently, her eyes focused on a blood sample under the microscope. Little did she know, a note was hidden within the evidence, written in crimson. "Every step brings us closer," the note read, sending a shiver down her spine.

Isabella couldn't shake the feeling that someone was watching her, a presence lurking in the shadows. Her thoughts raced as she considered the possibility that the killer was closer than she thought. "Who could it be?" she wondered aloud, her voice barely audible over the rain.

Isabella felt a mix of fear and determination, her mind piecing together the clues that pointed to someone she knew. "It can't be," she whispered, the realization dawning on her.

Dexter stood at the center, his eyes cold and calculating as he waited for Isabella. He had left one final note, confident she would come. Isabella entered cautiously, her resolve firm despite her fear. "Why are you doing this?" she demanded, her voice echoing in the empty space.