Let This Be Our Secret is a true-crime book by award-winning British journalist Deric Henderson about how Colin Howell, aided and abetted by his mistress and fellow-Christian Hazel Stewart, callously killed their spouses and buried the truth for 18 years by making the deaths look like a suicide pact.

[3] The body of nurse Lesley Howell, 30, wearing Walkman earphones and clutching photos of her four children, lay on the back seat of a car.

Colin Howell revealed that the two were murdered by their respective spouses at the time: himself and Sunday school teacher Hazel Buchanan (later, Stewart) who were in fact, lovers.

Deric Henderson's 2011 book tells the story of dentist Howell and his lover[4] with coverage of both trials and interviews of family members among others.

A publication summary reads: A series of disasters in Howell's life – the death of his eldest son, massive losses in an investment scam and the revelation that he has been sexually assaulting female patients – lead to him declaring that he is a fraud and a godless man.