When 35-year-old Leni McKenzie is knocked off her bike, her family's world is turned upside down. Leni and her sister Alice were best friends as well as siblings. But did they know each other as well as Alice thought? In the hope of coming to terms with her grief, she tries to piece together Leni's last weeks - but her discoveries only lead to more questions. And that's before the surprise reappearance of someone from the past. Life is certainly getting very complicated.