As temperatures soar across Europe during the hottest summer for 40 years, a series of hoax terrorist attacks is generating panic in London. Then a bus blows up on Oxford Street, and the hoaxes have suddenly become real. Student Brioni O’Brien has been desperately trying to contact her older sister since she unexpectedly returned early from travelling, so when Marissa’s bag is found near the site of the explosion, she fears the worst.

When a woman's body is discovered in a cathedral and hours later a young man is found hanging from a tree outside his home, Detective Lottie Parker is called in to lead the investigation. Both bodies have the same distinctive tattoo clumsily inscribed on their legs. It's clear the pair are connected, but how? The trail leads Lottie to St Angela's, a former children's home, with a dark connection to her own family history. Suddenly the case just got personal.

Marissa Irvine arrives at 14 Tudor Grove, expecting to pick up her young son Milo from his first playdate with a boy at his new school. But the woman who answers the door isn't a mother she recognises. She isn't the nanny. She doesn't have Milo. And so begins every parent's worst nightmare. As news of the disappearance filters through the quiet Dublin suburb and an unexpected suspect is named, whispers start to spread about the women most closely connected to the shocking event. Because only one of them may have taken Milo - but they could all be blamed.

When an old university friend invites Finn Fitzpatrick to speak at a conference at her alma mater, Finn reluctantly agrees. Now working as a solicitor with a side interest in investigation, Finn is busy with her own troubles but feels she can't say no to her former law school classmate. Even though she has no idea why she's been invited to the conference, or to the exclusive dinner in the College President's private dining room afterwards. Then, three days later, a body is discovered in the College grounds, and everyone who was at the President's dinner is a murder suspect. Including Finn.

Carol is a divorced teacher living in a small town in Ireland, her only son now grown. A second chance at love brings her unexpected connection and belonging—and sparks a flurry of speculation. What does a woman like her see in a man like that? What happened to his wife who abandoned him and his children all those years ago? Carol and Declan know their relationship is the talk of the town, but the gossip only serves to bring the couple closer.