Sleepy Hollow does not just reflect on variations of the Washington Irving story, it's basically about the two End Times "Witnesses" from the Christian Bible, and the "Four Apocalyptic Horsemen".
Here, those Biblical end times prophecies are melded with those of the Thuggee God Kali, shades of Gunga Din.
It's Hawley's turn to have his world upturned, as his old mentor shows up out of the blue to insist he "do a job" with her: To steal a statue of Kali from an obsessed collector, the descendant of a master mason whose specialty was secret traps, one of which Abby and Ichy almost succumb to.
Meanwhile Ichabod is further modernized by singing karaoke with Abby, who actually has a great voice, and Captain Irving takes a supernatural lie detector test from Katrina. But we can't shirk the feeling something is wrong with Captain Irving's Picture, no matter how "safe" Katrina deems him to be.
Basically this is our Sleepy Hollow edition of the basic "Monster of the Week" episode, as we wait for Henry to show up.