One afternoon in 1839, Emily Lowry’s husband vanishes from Wreckers’ Cay, an isolated island off the coast of Key West where he tends the lighthouse. As days stretch into months, Emily has no choice but to take charge of Wreckers’ Cay and her husband’s duties tending the light to support her three children - and a fourth on the way. Unexpected help arrives when a runaway slave named Andrew washes up on their beach. At first, Emily is intensely wary of this strange, charming man, whose very presence there is highly illegal. But Andrew proves himself an enormous help and soon wins the hearts of the Lowry family.