Daniel was the first boy to make Alison a mix tape. But that was years ago and Ali hasn’t thought about him in a very long time. Even if she had, she might not have called him ‘the one that got away’; she’d been the one to run away, after all. Then Dan’s name pops up on her phone, with a link to a song from their shared past. For two blissful minutes, Alison is no longer an adult in Adelaide with temperamental daughters; she is 16 in Sheffield, dancing in her too-tight jeans. She cannot help but respond in kind. And so begins a new mix tape. Ali and Dan exchange songs – some new, some old – across oceans and time zones, across a lifetime of different experiences, until one of them breaks the rules and sends a message that will change everything. Because what if ‘what could have been’ is still to come?