Katie is the sister who has it all: a flourishing career and a smart, loving fiance. Mia is the dreamer: no responsibilities, no thought for anyone but herself. Katie is relieved when Mia embarks on an around-the-world trip with her best friend. Then, one devastating night, Katie's is told the news that Mia is dead - and the police say it was suicide. When Mia's things arrive back, Katie clings desperately to Mia's journal as the last remaining part of her sister. She leaves behind her life in London and embarks on a journey to find out the truth. With only the entries of Mia's journal as her guide, Katie retraces the last few months of her sister's life, and begins to uncover the mystery surrounding her death. What she discovers changes everything, but is their sisterly bond strong enough to help Katie keep on searching for one final devastating truth?"