The Token - Sharon J. Bolton

''Seven beneficiaries. Seven people who stood to gain a huge amount of money, for a reason none of them yet understood.''Seven strangers receive a mysterious note informing them of their impending inheritance of billionaire Logan Quick''s fortune. They each receive a token and soon embark on a doomed cruise where they will have to conquer their own demons, and each other, for a chance at the money.But someone on this boat has something to hide. Can the survivors work out the truth...or are they too doomed to drown?