Brian O'Sullivan, an art history professor, learns he was adopted after finding letters sent by his birth mother sixty years earlier. Filled with emotion, he decides to find her, hoping Katrina is still alive. But before Brian begins his search, he is summoned to Europe by his Interpol team to solve an old art theft mystery. Still keeping his role in Interpol a secret from his wife, he heads to Amsterdam and investigates the diary of a Nazi SS officer embossed with the initials "KvR." As Brian's team looks for clues to where the art stolen by the Gestapo may be hidden, it's suggested the diary may have belonged to the Nazi who fell in love with Katrina before the war, Karl von Richter. The team's search then takes them to old churches and former mosques in Andalusia to look for the hidden paintings. Soon Brian's search to find his mother takes him to Italy and on a harrowing path through anguish, intrigue, and deception and into a dangerous conflict with a previously unknown stepbrother who wants to kill him. Will Brian's conflict with his wife be resolved? Will her truth be revealed? And what will become of Brian's relationship with Nina?