In this sisterly PS, I Love You, an introverted young woman is saddled with fulfilling her late sister’s 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 with more than a million followers. 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 soon Jodie is shocked when 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 – and keeps all of Bree’s followers – a corporate sponsor will pay off the crushing medical debt. It’s crazy. It’s terrifying. It’s impossible to refuse. So, despite her trepidation, Jodie plunges in, never imagining that in death, her sister will teach her how to live.