Melissa Brennan was a happy 5-year-old girl who lived with her single mom. She was enjoying a Christmas party at her apartment complex when she vanished. We typically don't feature unresolved cases (no body) on Solved Saturday; however, due to recent pleas for help finding Melissa, we wanted to bring you her case ASAP. If you know anything that could lead to her remains, contact the FBI. As always, stay curious, stay safe.