When snow falls, it blurs the line of sight. Sometimes it covers the world with a soft blanket, dampening everything else; sometimes it chills to the marrow, taking a vulnerable human body to the limits of freezing. In Julia Leigh's moving memoir, Avalanche: a love story, the movement of snow correlates both to the clinical specificities of the IVF process which she experiences, and to the emotional undulations which accompany it, always threatening to overwhelm.