When Jo Harper falls in love with a maverick archaeologist, Doug Marshall, she also falls into Doug's obsession with one of history's greatest mysteries of exploration: one hundred fifty years ago, Sir John Franklin and his crew of one hundred twenty men sailed two ships to the Arctic on a surveying trip and were never seen again. Doug has spent his entire life in search of an answer to what happened to them, sacrificing his first marriage and his relationship with his son, John, along the way. But as he and Jo plan their future together, a shocking accident forever changes their lives, leaving them shattered and unable to pick up the pieces. Devastated by the accident, John goes into self-imposed hiding. Jo, feeling abandoned, is confronted by the unthinkable-her young son, Sam, has a life-threatening disease and his only hope of survival lies with John, as he is a match for a bone marrow transplant. Desperate to find John in order to save her son, Jo cannot find anyone who can reach him. But soon she learns that John's fate is curiously tied to the Franklin Expedition. Haunted by the despair of those men lost in the Expedition and his own past, John has ventured into the ice floes of the Arctic in search of answers to what happened to Franklin's crew and to his own life. Unbeknownst to him, a frantic search is on, not only to save his life, but the life of a brother he doesn't know is in jeopardy.