Death is like outer space – a seemingly unknowable, terrifying blackness that yields beautiful discoveries and truths – if only you’ve got the right kind of rocketship. Thalia Rosewood has had a lifelong obsession with death, keeping her from living her life to the fullest. Mercy Wolfe has a brain tumor the size of a billiard ball, and a need for a new recruit before her next journey begins. Inigo Hanover is a reluctant tether to the world beyond, seeking to continue a cycle that exploration would halt. Go toward the light. Then go beyond. Euthanauts.