The universe, in its farthest recesses, unbeknownst to humankind, has abetted the creation of a sinister entity, a malign force capable of rearing bedlam and instilling fear to all that has life. With the world’s impending destruction carefully insured by the extraterrestrial body that lurks in the glitches of nature, life as we know it hangs by a precariously thin thread. Meanwhile, around the globe, uneasiness continues to foster - world leaders have finally taken notice of the invisible enemy.

In this prequel to the international best seller The Ruin, set 10 years prior, bright-eyed Carrie Ryan is at the very start of her career. When she has a hunch about an ongoing murder investigation, she knows it could be her only chance to prove herself and truly break into the “boys' club” of Dublin’s police force.

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.

Owen Pick’s life is falling apart. In his 30s and living in his aunt’s spare bedroom, he has just been suspended from his job as a teacher after accusations of sexual misconduct - accusations he strongly denies. Searching for professional advice online, he is inadvertently sucked into the dark world of incel forums, where he meets a charismatic and mysterious figure. Across the street from Owen lives the Fours family, headed by mom Cate, a physiotherapist, and dad Roan, a child psychologist. But the Fours family have a bad feeling about their neighbor Owen.

Pete Riley answers the door one morning and lets in a parent's worst nightmare. On his doorstep is Miles Lambert, a stranger who breaks the devastating news that Pete's son, Theo, isn't actually his son - he is the Lamberts', switched at birth by an understaffed hospital while their real son was sent home with Miles and his wife, Lucy. For Pete, his partner Maddie, and the little boy they've been raising for the past two years, life will never be the same again.

Kids have imaginary friends. Rachel knows this. So when her young son, Billy, miraculously recovers from a horrible flu that has proven fatal for many, she thinks nothing of Delfy, his new invisible friend. After all, her family is healthy and that's all that matters. But soon Delfy is telling Billy what to do, and the boy is acting up and lashing out in ways he never has before. As Delfy's influence is growing stranger and more sinister, and rising tensions threaten to tear Rachel's family apart, she clings to one purpose: to protect her children at any cost - even from themselves.

Having recently lost his mum to cancer, when eight-year-old Tom comes to live with Maggie, he is scared and alone. Tom has been taken into care following concerns from his teachers about his dad Mark's ability to cope as a single parent following the death of his wife. As a former soldier, Mark has resorted to his military training in order to cope with his young son, forcing him to scrub the floors until his hands bleed and perform repeated push-ups as punishment for his misdemeanors.

Named after the lager that christened her at birth, Stella's life is characterised instability and neglect. Her teenage mother abandons her in the first few weeks of her life, and left in the 'care' of her father, she ends up lying deserted in a house with no food, no water, no clothes and no warmth. She eventually lands in the care of foster carer Louise, who is determined to change her life for the better.

Eve, Justin, Susie, and Ed have been friends since they were teenagers. Now in their thirties, the four are as close as ever, Thursday night bar trivia is sacred, and Eve is still secretly in love with Ed. Maybe she should have moved on by now, but she can’t stop thinking about what could have been. And she knows Ed still thinks about it, too. But then, in an instant, their lives are changed forever.

Megan waits at the school gates for her six-year-old son, Daniel. As the playground empties, panic bubbles inside her. Daniel is nowhere to be found. According to his teacher, Daniel’s father picked up his son. Except he and Megan are no longer together. After years of being controlled by her cruel husband, Megan finally found the courage to divorce him. Hands trembling, she dials his number, but the line is dead. Six years later, Megan gets the call she has dreamt about for years. Daniel has walked into a police station in a remote town just a few miles away....

Esme is a start-up success who runs her own successful media company and heads up a series of investigative podcasts. She also has a beautiful home, where she lives with her sister, Michelle, and her son, Zachary. Sure, there’s an ex-husband hanging around - Owen likes to pop round a bit too often - but everything is civilised and amicable. She has life all tied up. But Esme knows that any successful podcaster is only as good as her last story, so she sets out on a new series of interviews to get to the truth behind Simone Fischer’s high-profile murder of her husband.

Ten years ago he killed my son. Today I married him. Ten years ago my darling son Jesse was murdered and our perfect family was destroyed. My strong, handsome boy, so full of life, became a memory, a photo I carried with me everywhere. But today I’m finally close to finding happiness again. My ash-blonde hair has been curled into ringlets. Carefully placed white flowers frame my delicate features. The small, drab chapel has been prettied up with white satin, and there are tiny red hearts scattered on the small table where I will soon sign the register with my new husband.

It seems like an ordinary Wednesday, until the phone rings. A mysterious caller with a chilling threat. Journalist Alice Henderson hangs up, ready to dismiss it as a hoax against the newspaper. But the next Wednesday, the stalker makes another move - and it becomes clear that this is all about Alice. Someone wants her to suffer, but for what? Her articles have made her a popular local champion - could it be her past rather than her work that’s put her life in danger?

Dorothy Graham is dead, which is inconvenient, not least for her. Luckily, she has planned for this eventuality. Now, if any of the truly dreadful people she is related to want to get their hands on her money, they’re going to have to do so via a fiendish difficult and frankly bizarre competition of Dorothy’s devising. After all, just because you’re dead, it doesn’t mean you can’t enjoy a last laugh at the expense of people who made your life miserable.

Epiphany ‘Pip’ Bloom is down on her luck. She can barely afford cat food, and just because Most has three legs doesn’t mean he eats any less. So she absolutely can’t afford to mess up her latest temp job. But when she walks through the door of the private investigation firm, her new boss mistakes her for a missing persons expert. He then charges her with finding Matty Price - the teenage son of two A-list celebrities - who has mysteriously disappeared from his home in Kensington.