The Kingdom of Cards is made of districts. The District of Diamonds, the District of Hearts, the District of Clubs, and the District of Spades. Everyone that lives inside the kingdom is cut off from the world, cut off from each other. But when five teenagers discover a network of underground tunnels, they'll learn that even the most hidden secrets will one day be dug up.

Misunderstood and overmedicated, twelve-year-old Lilith Bloom finds the prospect of a grand family reunion decidedly dull... That is, until she discovers that the rose garden surrounding her grandfather's Berlin mansion is, well, completely and utterly carnivorous. Armed with Panther, her talking pet whippet, and the help of the mute boy next door, Lilith must unravel the secrets behind the mysterious estate, all while her family remains gloriously unaware that they are about to be devoured.