The Collective by Alison Gatling

Camille Gardner is a grieving and angry mother who, five years after her daughter's death, is still obsessed with the privileged young man she believes to be responsible. When her rash actions draw the attention of a secret group of women - the collective - Camille is pulled into a dark web where these mothers share their wildly different stories of loss as well as their desire for justice in a world where privilege denies accountability and perpetrators emerge unscathed. Fuelled by mutual rage, these women orchestrate their own brand of justice through precise, anonymous, complexly plotted and perfectly executed revenge killings, with individual members playing a small but significant role in each plan. As Camille struggles to comprehend whether this is a role-playing exercise or terrifying reality, she must decide if these women are truly avenging angels or monsters. Becoming more deeply enmeshed in the group, Camille learns truths about the collective-and about herself-that she may not be able to survive.