Letters from the Labyrinth is the sixth studio album by the Trans-Siberian Orchestra. It was released on November 13, 2015. The album is a collection of songs and stories. The stories being a nod to their previous full album Night Castle, using the stories written by the protagonist. The album reached #7 on the Billboard 200 album chart and #1 on the Billboard Top Rock Albums chart. This album was the last for TSO members Paul O'Neill, David Zablidowsky, and Vitalij Kuprij before their deaths. O’Neill and Zablidowsky died in 2017, and Kuprij died in 2024.