In 1911 two British heiresses, Claire and Dora Williamson, read a brochure about a revolutionary fasting treatment that promised a lifetime of good health. The sanatorium in the village of Olalla, west of Seattle, was surrounded by a beautiful forest, sparkling waters and fresh air. The sisters agreed it sounded perfect and exactly the restorative holiday they needed. But within a month of arriving, under the supervision of Doctor Linda Burfield Hazzard, Claire and Dora began to realise the frightening truth – they were not patients but prisoners at the isolated sanitorium.

Colorado, 1976. When Reverend Mike Fuller and his beautiful wife, Sharon, arrive in the sleepy town of Rocky Ford, local residents think something’s off about the new couple. The God-fearing minister is gruff and cold, while charismatic Sharon has her husband wrapped around her finger.

In 1977, in an Ohio Amish community, pregnant wife and mother Ida Stutzman perished during a barn fire. The coroner’s report: natural causes. Ida’s husband, Eli, was never considered a suspect. But when he eventually rejected the faith and took his son, Danny, with him, murder followed. What really happened to Ida? The dubious circumstances of the tragic blaze were willfully ignored and Eli’s shifting narratives disregarded.

On the beautiful island of Jersey, the wealthy Newall family were the epitome of success: Roderick, the eldest son, was a handsome Royal Green Jackets lieutenant, and his younger brother, Mark, was a financier. On the night of 10 October 1987 Nicholas and Elizabeth Newall went out to dinner with their sons to celebrate her 48th birthday. It was the last time that the parents were seen alive. Sometime during that evening, they were bludgeoned to death at their home, their bodies removed, leaving only bloodstains behind.

On the morning of July 18, 2014, 41-year-old Florida State law professor Dan Markel dropped his boys off at preschool, hit the gym, and headed home to his quiet, tree-canopied neighborhood. Within seconds of pulling into his garage, two .38-caliber bullets fired from point-blank range were lodged in his brain. His brutal slaying defied explanation.