Secrets Between Friends by Tracy Buchanan

The old house hides her darkest secret-and there's no running away this time.
Twenty years ago, Liz left Easthaven to escape the memory of one tragic night at Lakewell Manor. Only she and her best friend Tamsin saw what really happened, and in the aftermath they drifted apart. Now she's forced back after a nasty divorce, with two daughters in tow, the shadows of that terrible night lurking on every corner. With a custody battle looming, she's one wrong move away from her life falling apart completely.
So when news arrives that Tamsin, too, is returning to Easthaven, Liz fears their reunion will bring the awful truth spilling out into the open. But when she finally meets Tamsin, now mistress of the clifftop house whose locked gates have guarded the friends' secret all these years, she's in for a surprise. Tamsin looks different, and she doesn't remember Liz, let alone what happened that night.
Something is clearly wrong. But confronting Tamsin means reliving the nightmare Liz has been running from for twenty years. Can she risk exposing what happened that night, knowing that the truth will destroy everything?

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