Fort Salem excitedly greets male visitors on the eve of Beltane, but Raelle and Scylla's budding romance is interrupted by the arrival of a mysterious man from Scylla's past. One of the male witches catches Tally's eye, but she is unsure of how to proceed. Meanwhile, Alder attempts to convince the Hague, an international military council of witches, to follow her strategy against the Spree and is startled by the news of an escalating humanitarian crisis in the Tarim Basin.

The unit travels off base for the high society wedding of Abigail's cousin. Raelle throws herself into her relationship with Scylla, who, unbeknownst to Raelle, faces an impossible choice. Abigail becomes disillusioned with her privilege while amongst the notable Bellweather line. And Tally gets hit with two life-altering revelations that change the very fabric of the unit.