Palm-sized Jade Sterling was saved by Killian Grant, Marquess Grant's heir, who made a marriage pact. On their wedding night, kisses turn her thumb-sized. By day, she hides in his sleeve, spying as a tiny agent; by night, she's full-sized. A curse forbids their intimacy. Vincent Grant, Eldest Master Grant, frames them with traps. They join forces to fight manor conspiracies, trace and break the curse, and gain love.