May 1942 - Regan O'Reilly comes from a long line of police officers. She would have followed her father and brother into the Force, but women officers are rare and usually relegated to the status of social workers. Now she's a private investigator with her own agency and the freedom to live her life the way she wants. That is, until she meets widower Mark Harris and his delightful son, Patrick, who have plans of their own for Regan.

Beneath the surface lie deadly secrets... DI Shona Oliver agreed to move to Dumfries with her ex-banker husband when their teenage daughter got in with a bad crowd in London. As a Glasgow native, she's back on home turf. Living on the shores of the Solway Firth allows Shona to continue as an RNLI volunteer, and a call out to recover a woman's body indicates foul play. Police in Cumbria take the case but links back to Scotland keep Shona's team involved. As they investigate, reports of people trafficking and a spate of thefts from local shops compete for attention with a large scale drug bust.

After a scandal forces DI Kelly Porter out of the Met, she returns home to the Lake District. Crimes in the Cumbrian constabulary tend to be minor, but Kelly begins work on a cold case that shocked the local community - the abduction and brutal murder of a 10-year-old girl. 

Special Agent Mia North is a rising star in the FBI—until, in an elaborate setup, she’s framed for murder and sentenced to prison. When a lucky break allows her to escape, Mia finds herself a fugitive, on the run and on the wrong side of the law for the first time in her life. She can’t see her young daughter—and she has no hope of returning to her former life.

Criminal Defense Attorney Mitch Turner is awoken in the middle of the night by a message from his nerdy law school employee Timothy Cooper begging Mitch for help. Uncertain about the problem from Timothy's cryptic texts, Mitch Turner slips into his suit and heads over to visit Timothy, unable to imagine any reason why Timothy would be calling for help at such a late hour. Mitch arrives to find the police at Timothy's apartment and learns that Timothy's roommate was murdered.