In 1939, the S.S. Saint Louis spent several days anchored at Havana while waiting for the Cuban authorities to allow 900 Jewish refugees from Germany into their country. Confident that a painting by Rembrandt that had belonged to their family since the 17th century--and which they had smuggled on board the ship--would convince the Cubans to let them in, little Daniel Kaminsky and his uncle waited at the dock for their relatives to disembark. But the...