Ava doesn't believe it when the email arrives to say that her twin sister is dead. It's not grief or denial that causes her scepticism - it just feels too perfect to be anything other than Zelda's usual manipulative scheming. And Ava knows her twin.

Two years after she left, vowing never to speak to Zelda again after the ultimate betrayal, Ava must return home to retrace her errant sister's last steps. She soon finds notes that lead her on a twisted scavenger-hunt of her twin's making.

Letter by letter, Ava unearths clues to her sister's disappearance: and unveils harrowing truths of her own. A is for Ava, and Z is for Zelda, but deciphering the letters in-between is not so simple...

A clever, twisty, suspense novel for readers of The Ice Twins by S. K Tremayne and Reconstructing Amelia by Kimberley McCreight.