Ciel Phantomhive, the queen's watchdog, is given two tickets to go to a traveling circus for himself and his demon butler, Sebastian. His job is to enter the circus and look for multiple missing children that are believed to be abducted.

Ciel Phantomhive, the queen's watch dog, is given two tickets to go to a traveling circus for himself and his demon butler, Sebastian Michaelis. His job is to enter the circus and look for multiple missing children that are believed to be abducted by the circus. At first the circus seems innocent but takes a dark path the further Ciel and Sebastian dig.—Robbie Dock

Full of wonder and excitement, the Noah's Arc Circus troupe has captured audiences with their dazzling performances. Yet these fantastic acts do not come without a price. Children have mysteriously gone missing around London, correlating to that of the group's movements. Unsettled by these kidnappings, Queen Victoria sends in her notorious guard dog, Ciel Phantomhive; and his ever-faithful demon butler, Sebastian Michaelis, on an undercover mission to find these missing children. Trying to balance their new circus acts with their covert investigation under the big top, however, proves to be quite a challenge. With the other performers growing suspicious and the threat of the circus' mysterious benefactor looming overhead, what the two discover will shake Ciel to his very core.

A circus has come to London, and like the city's entranced residents, Ciel and Sebastian pay the circus a visit. Only, they have not come to leisurely spectate the show, but to look into the disappearances of several children all over England that coincide with the travel routes of the Noah's Ark Circus. To gain better insight into the circus, Ciel and Sebastian join the troupe.