Like Millie, Elizabeth Holden is an avid roller derby player, a blocker with Madison Roller Derby since 2015. Liz's league-mates know her as Auntie Matter; her derby name is a reference to her job teaching college physics. (And, yes, she is also an aunt. Hi, William and Hugo!) When not busy writing, playing derby, or teaching, Liz is most likely leading international trips with her company, Leaping Hound Travel. Liz also co-hosts an X-Files podcast, We Want to Believe, with her sister. Liz's tattoos are vibrant and numerous, her laugh is loud, and her heart belongs to her pet greyhounds. Learn more about her at elizabeth-holden.com.