When Crane finally escapes their clutches (which was actually a relatively easy affair), he finds that he was underground in the nation’s capital.
You might be wondering what he’s doing in Washington, D.C., and the answer, surprisingly enough, is actually that he lives there now.
When Season 4 opens, he’s still being held and questioned by those enigmatic individuals two weeks later.
By the end of the episode, with no more real ties to Sleepy Hollow and obvious supernatural forces gathering in D.C., he decides to stay in town and do what he does best: fight demons and other creepy crawlies.