An unnerving discovery in a garden shed sends Renee Montoya rushing to Ryan to ensure the city is on high alert. Her terrifying theory – a Bat Trophy has entangled a new host, and her thorny ways are weaving their way through Gotham. Alice is suspiciously eager to help the Bat Team, and Sophie seeks vengeance for an incident involving her sister.

Mary and Alice continue their sisterly bonding, Ryan, Luke and Sophie are desperate and willing to do almost anything to stop them…even entertaining a dangerous proposition by Renee Montoya that finally rid Gotham of Pamela Isley. As the team hunts for the source of Poison Mary's power – and potential demise – Renee is forced to revisit her heartbreaking past. Meanwhile, Marquis grows more unhinged and throws a spectacularly sinister soiree at Wayne Tower…and everyone is invited.