For the last year, yacht stewardess Jo Walker has been attempting to complete a bucket list of 30 things she wants to accomplish by her 30th birthday. Jo has almost everything she's ever wanted, including a condo on the beach (though she's the youngest resident by several decades) and an exciting job (albeit below deck) that lets her travel the world.

Jo is on track until the death of her nephew turns her life upside down, and the list falls by the wayside. But when her two nieces show up unannounced with plans to stay the summer, they discover her list and insist on helping Jo finish it. Though the remaining eight items (which include running a marathon, visiting 10 countries, and sleeping in a castle) seem impossible to complete in 12 weeks, Jo takes on the challenge.

When she summons the courage to complete item number five - kiss a stranger - and meets Alex Hayes, all bets are off. As her feelings for Alex intensify and Jo's inability to confront difficult emotions about her family complicates her relationships, she must learn to quit playing it safe with her heart before she loses what matters most.