A gripping sci-fi mystery wrapped in an LGBTQIA love story that bends space, time, myth and science. Lumi is an Earth-born healer whose Mars-born spouse Sol disappears unexpectedly on a work trip. As Lumi begins her quest to find Sol, she delves gradually deeper into Sol's secrets - and her own. While recalling her own path to becoming a healer under the guidance of her mysterious teacher Vivian, she discovers an underground environmental group called Stoneturners, which may have something to do with Sol's disappearance. Lumi's search takes her from the wealthy colonies of Mars to Earth that has been left a shadow of its former self due to vast environmental destruction. Gradually, she begins to understand that Sol's fate may have been connected to her own for much longer than she thought. Part space-age epistolary, part eco-thriller, The Moonday Letters is also a love story between two individuals from very different worlds.