The dovekie is a stocky seabird the size of a child's heart that spends its winters on the coast of Newfoundland, thriving in one of the toughest climates on Earth. The polar bear is an apex predator, designed to persevere in the Arctic's extreme conditions. The North Atlantic right whale outweighs the humpback by more than twenty tons and feeds on enormous quantities of tiny plankton in northeastern waters before migrating south for the winter. In Message in a Bottle, wildlife biologist and writer Holly Hogan brings to extraordinary life the wonder and resilience of these creatures and many other birds, fish and marine mammals she has encountered in sea voyages from the Arctic to the Antarctic oceans. However, in her travels she has noticed a troubling pattern: the constant presence of plastic, in the form of adrift fishing gear ("ghost gear"), garbage and micro-plastics which form an invisible but pervasive smog in our oceans and threaten even the most seemingly resilient forms of sea life.