In this sisterly PS, I Love You, an introverted young woman is saddled with fulfilling her late sisters final wish: completing her bucket list while millions of people follow along online.

Jodie Boyd is a shy and anxious twenty-something, completely unsure of what to do with her life. Meanwhile, her older sister, Bree, is an adventurous, globe-trotting Instagram influencer. Bree is the most alive person Jodie knows until her unfathomable, untimely death from leukaemia. The Boyds are devastated, not to mention overwhelmed with medical debt. But Bree had a plan, and to Jodie’s surprise a new post appears on her sister’s Instagram feed.

The first of many posts Bree recorded in secret, it contains a jaw-dropping challenge for Jodie: complete Bree’s bucket list. From fly over Antarctica to fall in love, if Jodie pulls it off, a corporate sponsor will pay off the crushing medical debt.

Its crazy. Its terrifying. Its impossible to refuse . . .