Ep 16. His Butler, in an Isolated Castle

As the title suggests, "His Butler, in an Isolated Castle" takes place in a remote castle, where the Phantomhive family has been invited by a wealthy nobleman to attend a dinner party. Ciel and Sebastian set off to the castle, but they soon realize that things are not as they seem.

Upon arrival, they are greeted by a group of eccentric characters, including a woman who claims to have a connection to Sebastian's past. As the night goes on, strange and unsettling events occur, and it becomes clear that the castle is home to some secrets that the guests are not meant to uncover.

Despite the danger, Ciel and Sebastian remain determined to investigate the mysterious occurrences. Their efforts lead them to discover a plot involving a group of cultists who seek to resurrect a demon in the castle's underground chambers. The cultists have been manipulating the nobleman, who is revealed to be none other than a former ally of Sebastian's.

But the cultists' plans are thwarted as Ciel and Sebastian work together to take them down. In the end, the castle is destroyed in a fiery explosion, but not before Ciel and Sebastian are able to escape.

As always, "His Butler, in an Isolated Castle" showcases the strength of Ciel and Sebastian's partnership, and their unwavering commitment to uncovering the truth. It also introduces new characters and elements of mystery that add depth to the overall story. Fans of the series will not be disappointed by this suspenseful and action-packed episode.