In this sisterly PS, I Love You, an introverted young woman is saddled with fulfilling her late sister’s final wish and 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, hugely successful Instagram influencer with more than a million followers. She's the most alive person Jodie knows – until Bree’s unfathomable, untimely death from leukaemia. The Boyds are devastated, not to mention overwhelmed with medical debt, but Bree thought of everything – and soon, Jodie is shocked by a new post on her sister's Instagram feed.

The first of many Bree recorded in secret, the post foretells a jaw-dropping challenge for Jodie: to complete Bree's very public bucket list. From ‘fly over Antarctica’ to ‘perform a walk-on cameo in a Broadway musical’, if Jodie does it – and keeps all Bree’s followers – a corporate sponsor will pay off the staggering 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, and that the last item on the list – ‘fall in love’ – may just prove to be the easiest.