It's every parent's worst nightmare: Your child goes out one day, vanishes off the face of the earth and no one seems to care. You need to fight tooth and nail to try and get anyone in authority to pay attention. On September 24, 1971, one horrifying choice forever shattered the lives of 16-year-old Cathy Marie Moulton's loved ones. A bright and vibrant adolescent who made consistent and appropriate life decisions suddenly made an impulsive and poor choice. She disappeared without a trace that day in Portland, Maine. More than 40 years later, Portland Police Department case #71-60141 (Cathy Moulton Missing-Endangered) is one the oldest active missing person cases in North America. Despite the best efforts of veteran investigators and an array of potential leads, the case remains unsolved. In this book, you will follow along while cold case detectives from Portland, Maine re-open the investigation a frigid twenty-five years after Cathy vanished. Municipal police detectives and federal criminal investigators in the United States and Canada closely collaborate and follow-up on old leads while developing many new ones in a rare example of cross-jurisdictional agency cooperation; spanning from Nova Scotia to British Columbia, Canada and from Maine to Florida to California in the United States. Investigators methodically explore how and why Cathy seemingly disappeared into thin air from the streets of Portland, Maine.