This short e-book answers the question, "What are the key challenges that retirees face after they transit to retirement?" The answer to this question is guided by a framework that the author has postulated as 'The F.I.S.H in Retirement', comprising four challenges namely: finances, intellect, social aspects and health. In the book, each challenge is defined and illustrated by a case study and pictorial image. The awareness brought about by the book illuminates the reader's perception of retired life and empowers him or her with knowledge to kick-start or enhance retirement planning.