When the body of a young man is discovered in a derelict building, DCI Cassie Stuart is called in to investigate with her partner, DI Sunil Khan. Jimmy Sullivan was a homeless boy, murdered in 1976 when the building was a hostel. His diary implicates four suspects; a clergyman, an eminent entrepreneur, a community worker and a wheelchair-bound husband caring for his wife. Each has a secret to hide. As their lies unravel, the people they love most begin to wonder what else they might be capable of. Nothing in this case is black and white. Can you ever really know the people closest to you? What secrets have they buried?

Edith's dreams of retirement to the sun with her long-term suitor Phil are shattered when her 50-year-old son Roger arrives home, seeking to recapture his boyhood happiness.

A divorcee, Jack has finally found real happiness with fiancée Sara, but his unhinged ex-wife and mother of his kids, Hillary is determined to destroy it.

Martin Bryce lives in a quiet suburban close with his wife Anne. He does his best to "organise" the leisure time of all of the other inhabitants of the close, running umpteen societies and doing "good works". He's is quite happy with his lot until Paul Ryman moves in next door.