When the Morning Post writes about the legendary Green Ray's elevating effects on the mind and soul, Helena Campbell vows to experience it for herself, postponing the wedding being forced upon her against her will. Together with her uncles, Sam and Sib Melville, she sets off on what becomes a near-epic quest. Joining them in the search are two would-be suitors for Helena, one an artist, the other an amateur scientist. Together, they will voyage to a distant shore - and beyond - braving hurricanes, testing their patience and resolve, and ultimately finding their own true selves.