Blackpool 1986. Twenty year old Claire Pearson's mundane life working in an antique shop is shaken up by a secret affair with a coworker, Tim, who's married and seventeen years her senior. Claire falls madly in love, but everything changes when Tim is fired for an unclear reason, then their boss Sharon is found murdered. Suspicion falls on Tim, whose shifty attitude leads Claire to believe he's hiding something. With the police investigating everything that took place at the shop, she knows it's only a matter of time before her relationship is exposed. Claire's sure that Tim couldn't be the killer, so she takes it into her own hands to find proof of his innocence. But as she digs deeper into Sharon's life, she learns she's not the only one with something to hide