I'm not sure this fits within the genre of true crime, but I've recently been reading about the disappearance of Jennifer Kesse in Florida in January 2006. Aged in her early/mid 20s, this lady never showed up for work one morning. She spoke to her boyfriend just before going to sleep the night before at 10pm. However, two phones in her possession were powered off shortly afterwards at 10.30pm and apparently had been pinging in different areas. The prevalent theory is that she was abducted early the following morning, as there was evidence to suggest she got ready for work, including the shower stall being wet, and clothes laid out.
The most bizarre and creepy aspect of the disappearance is that her car was found two days later in a nearby apartment complex. Someone was caught on camera leaving the car at 12 noon on the day she disappeared - there was a close up shot, but the guys face was not revealed.