Vivian drove to her sister Millie’s house on the leafy, suburban North Gate Drive in Silver Spring, Maryland.

As Millie would have already left for work, Vivian knew the only ones home would be her nephew Trevor and his nurse, Janice Saunders. Janice was due to finish her 10-hour night shift at 8:00 am.

Vivian pulled up out the front of Millie’s house and immediately noticed the garage door was wide open with nobody in sight. Millie’s minivan was missing. Vivian had never known her sister to leave the garage open when she wasn’t home.

Upon entering the garage, something was clearly amiss. Sofa cushions were strewn across the floor. Vivian’s attention was then drawn to a sound coming from inside the house that was both familiar and out of place. It was the furious, high-pitched beeping of young Trevor’s apnoea monitor – the sound it made to alert the nurse Trevor had stopped breathing…