Board Thread:Spoilers!/@comment-1894786-20150127205050

"Experience Wonderland in the unforgettable origin tale of Jefferson, the portal-jumping Mad Hatter, and witness the loss that caused him to lock away his magical hat for good." -  http://www.digitalspy.com/comics/s181/once-upon-a-time/news/a624199/once-upon-a-time-returns-to-marvel-with-out-of-the-past-graphic-novel.html#~p2BspiTHvxVxjk

This really hints at us finally meeting Grace's mother and seeing what made him lose his wife. Since he straight up admits he hates Wonderland in "Hat Trick", I think she's from there. Or died there. But I'm sure Jefferson's wife has something to do with Wonderland (remember when we all thought Alice was his wife? LOL) 