Meteorologist Sky Matthews does not like surprises. Sky monitors her life like she does the weather, carefully and with a scientific eye. So, when she misses out on her dream job abroad and finds herself taking a position on an island off the Cornish harbour town of St Felix instead, she feels completely at sea. Worse still, she has to work alongside TV weatherman Sonny Stevens, who barely knows his storms from his tsunamis. It doesn't take long for Sky to become enchanted by the weather patterns over St Felix. Sonny is convinced they link to local folklore, but Sky knows her science too well for that. Until she meets Walter, a local weather watcher with no qualifications beyond a lifetime of experience and Sky is forced to question everything she thought she knew about the weather, herself... and Sonny.