If you could travel back in time to see any concert, who would you go to see?
2021, North London. The home of Caroline and Jon Tangent. But it's no ordinary suburban life.
Jon has invented a time machine so they can visit iconic gigs in history: Woodstock '69, David Bowie as Ziggy Stardust, Edith Piaf in 1930's Paris. An inexhaustible bucket-list. But they can't tell anyone they're doing so.
As their trips to the past continue, they begin to realise how it could change a devastating moment from their own past. But for Caroline, it's clear they don't want the same outcome.
Until, on one trip, one of them does something unthinkable which will change both their lives forever.
For fans of Matt Haig, Claire North and Audrey Niffenegger.