Katie is the sister who has it all a flourishing career and a smart, loving fiancee 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