A magical plague of clockwork zombies threatens London, forcing a newlywed Oracle to race against time to save her husband. Elle Chance, now the Oracle tasked with protecting the world from Shadow, finds her marriage to ex-Warlock Hugh Marsh strained as he misses his former life. When Marsh agrees to help the police with a magical mystery, his heart is literally replaced with a clockwork device, turning him into a zombie. As this affliction spreads through London, Elle must team up with Marsh's old friend, Loisa Beladodia, to find his heart and reverse the plague before it's too late.

The premise sets up a high-stakes urban fantasy narrative blending romance and mystery, with a unique steampunk-inspired affliction. The story appears to focus on Elle's efforts to navigate her new responsibilities as Oracle while confronting a personal crisis involving her husband. The inclusion of elements like a clockwork heart and a zombie plague suggests a fast-paced plot with significant magical and potentially dangerous challenges. The narrative likely explores themes of identity, duty, and the consequences of dabbling in forbidden magic.