After author Jess Keefe ended things with her long-term boyfriend, she moved in with her brother Matt in hopes that family could help her not only heal from the break-up but also evolve into a healthy adult. But that fantasy ended when Matt's heroin addiction came roaring back after lying dormant for years, leading to a fatal overdose on a warm October night. Thirty-Thousand Steps is a powerful and transformative memoir that interweaves the author's obsessive training to becoming a distance runner, along with her singular, focused research into the science of addiction in the shadow of grief after the death of her brother. In the year that followed Matt's death, Jess lived alone for the first time in her life while struggling with a loose, bereaved mind. She became obsessed with what happened to her brother and how things could have been different. She dove into research about addiction and drugs. She excavated their shared childhood and young adulthood for clues. During this time, she was also learning how to become a distance runner. Jess pushed her body to its limits to quiet the chaos in my mind. After losing Matt, she knew she'd never be the same. With propulsive narrative scenes, a unique voice, empathy, and even humor, Jess weaves her grieving experience together with explorations of the social, political, and scientific drivers that influenced what happened to her brother. Thirty-Thousand Steps explores the psychosocial risk factors that lead to addiction, the cudgel of Catholicism, the joy and shame in the early-aughts queer experience, and the extents to which one can push mind and body to regenerate after a major loss.