After an uneventful Friday at the Dublin office, Cathal faces into the long weekend and takes the bus home. There, his mind agitates over a woman named Sabine with whom he could have spent his life, had he acted differently. All evening, with only the television and a bottle of champagne for company, thoughts of this woman and others intrude - and the true significance of this particular date is revealed.

For decades the Magistrate has been a loyal servant of the Empire, running the affairs of a tiny frontier settlement and ignoring the impending war with the barbarians. When interrogation experts arrive, however, he witnesses the Empire's cruel and unjust treatment of prisoners of war. Jolted into sympathy for their victims, he commits a quixotic act of rebellion that brands him an enemy of the state.

In 1917, deep in the snowy mountains of occupied Korea, an impoverished local hunter on the brink of starvation saves a young Japanese officer from an attacking tiger. In an instant, their fates are connected — and from this encounter unfolds a saga that spans half a century.

In a peaceful retirement village, four unlikely friends meet weekly in the Jigsaw Room to discuss unsolved crimes; together, they call themselves the Thursday Murder Club. When a local developer is found dead with a mysterious photograph left next to the body, the Thursday Murder Club suddenly find themselves in the middle of their first live case.

After Rita is found dead in a church she used to attend, the official investigation into the incident is quickly closed. Her sickly mother is the only person still determined to find the culprit. Chronicling a difficult journey across the suburbs of the city, an old debt and a revealing conversation, Elena Knows unravels the secrets of its characters and the hidden facets of authoritarianism and hypocrisy in our society.