Jaq and Lily have no past. They need no past.

Endless present stretches around all the women on the ship Scylla. But Lily has always been fickle, and when the crew rescues a man adrift, she's quick to trade Jaq for the more novel lover. Enraged and heartbroken, Jaq considers the many ways to kill this interloper: The pigs will eat most anything. The sea is deep and choppy and cold. And she has venoms all her own, if it comes to it.

Unfortunately, it won't be so simple.

With the man's presence, the entire crew is infected with memories of before, and the ship's fragile peace begins to shatter. Each woman learns how she came to be aboard, igniting a thirst for retribution that gives the usually aimless ship direction. As Scylla draws closer to shore, Jaq must decide whether winning back Lily's affection is worth joining her in a quest for revenge that could destroy their endless present, separating them forever.