Lara is running from a fractured marriage, and an unfathomable loss that consumes her. Drawn to the beautiful, open expanse of sky and the possibility of a new life, Lara finds herself working on a secluded property in Montana caring for horses. There she meets Peter, a man trapped in the darkness of his disability and closed off from the world around him.

Diagnosed with an incurable cancer, Julia is forced to come to terms with a life largely unlived. Haunted by past trauma and regrets she cannot amend, she has built a wall around herself, insulating her from the world.

Meanwhile, Gillan McArdle’s academic career is ending because of one stupid lapse of judgement. Offered a short-term contract, he lands on the Hebridean island of Harris to investigate obscure animal bones. Quickly dismissing the unicorn skull as a thinly disguised fake, he can’t deny there’s something unusual about these bones. Baited by rumors of a majestic tusked horse roaming the uplands, Gill begins to suspect someone is manipulating him. As he gradually unravels the mystery of the skull, he grasps a disturbing conclusion: If this creature does exist, the evidence suggests it’s a killer.

It’s the year 2022. Dani Peterson has been walking in the west of Ireland, conducting historical research for her dissertation. But when she seeks shelter from a storm in Aideen O’Brien’s car, she gets more history than she bargained for. Aideen is a Time Link, with secret access to time travel technology. She sends Dani to 1978 to meet a younger version of herself. The two fall in love and Dani joins Aideen in her work. Their boss is a man from 2253 named Charles Burke, who says his mission is to save the future.

An outcast her entire life, Corvina Clemm is left adrift after losing her mother. When she receives the admission letter from the mysterious University of Verenmore, she accepts it as a sign from the universe. The last thing she expects though is an olden, secluded castle on top of a mountain riddled with secrets, deceit, and death.