It’s 1923 when Pearl Glenham and her father are invited to a mysterious country house party on the Dorset coast, by a total stranger.

Her father claims not to have any prior association with Highcliffe House, but upon arrival, it is apparent that he has a secret shared history with several of the guests. Belatedly discovering that her father was blackmailed into attending, Pearl’s worries are compounded when their elusive host fails to even appear…

Intimidated by everyone at the party, she escapes to the nearby cove and stumbles upon a mysterious mercury clock hidden in a cave. This strange encounter sets in motion a series of events that culminates in an horrific house fire, claiming the lives of all the guests, including Pearl herself.

But then, Pearl wakes up back in the cave, seemingly destined never to live past midnight. She can repeat the day. But can she change its outcome?