Yvonne Carmichael has worked hard to achieve the life that she always wanted: a high-flying career in genetics, a beautiful home, a good relationship with her husband and their two grown-up children. Then one day she meets a stranger at the Houses of Parliament and begins a passionate affair with him - a decision that will put everything she values at risk. At first she believes she can keep the relationship separate from the rest of her life, but she can't control what happens next.

Following the discovery of the body of a well-loved parish priest at Ballyglass House - the Co Wexford family seat of the aristocratic, secretive Osborne family - Detective Inspector St John Strafford is called in from Dublin to investigate. Facing obstruction from all angles, Strafford is determined to identify the murderer. But, as the snow continues to fall over this ever expanding mystery, the people of Ballyglass are equally determined to keep their secrets.

Pete Riley is a stay-at-home dad; his partner, Maddie, works in advertising. After Pete drops two-year-old Theo off at nursery one morning, he's politely accosted by a man who looks just like Theo. The man, Miles Lambert, breaks the devastating news that Theo is in fact not Pete's son, but his - the two babies got mixed up at hospital and Miles and his wife, Lucy, now have the Rileys' son at home. They've already carried out DNA testing to prove it.

In rural Somerset, in the middle of a blizzard, the unthinkable happens: a school is under siege. From the wounded headmaster in the library, unable to help his trapped pupils and staff, to teenage Hannah in love for the first time, to the parents gathering, desperate for news, to the 16 year old Syrian refugee trying to rescue his little brother, to the police psychologist who must identify the gunmen, to the students taking refuge in the school theatre, all experience the most intense hours of their lives, where evil and terror are met by courage, love and redemption.

I’m Lucy, and I have a secret I have a beautiful home that I’m desperate to escape. But that’s not my secret. I tell my friends I’ve never wanted children when I always have. But that’s not my secret. My husband is a celebrated surgeon who tries to control me. But that’s not my secret. Adele knows. Once upon a time, I knew everything about her and she knew everything about me. Best friends forever. But now our secret is beginning to surface. I can trust her more than anyone. We made a pact. And she’s never do anything to hurt me. Would she?