Sink or Swim (Upper-Intermediate + CD) is a business English reader by Andy Cowle. The story follows Eddie Munro, a successful businessman who rebuilt his life after being unfairly fired by his former boss. During a luxury cruise, Eddie unexpectedly meets that boss again, leading to a tense confrontation and a mysterious disappearance. Designed for upper-intermediate learners, the book combines workplace English with suspense and includes an audio CD and glossary for language practice.