Desperate for one last great adventure, 73-year-old ROSIE packs her new floral bathing suit, stuffs her bra with money, and boards a bus for her birthplace—Mexico. Her son ALEX reports her missing, and the Los Angeles police find grim evidence of her death. Alex grieves…until months later, when a shocking letter arrives. Postmark: Baja Sur, Mexico. She is well. She is happy. She will write again. Alex hires CAP, a private investigator; and the pair follow her trail deep into Mexico—determined to find her before her demise becomes a reality.