Everyone has something in their history they'd like to keep there...
Chase has more than most. Only he's not going to be allowed to forget as someone in his past has come looking for him. And he's on a deadline.
Vanessa is all about moving forward in her life. There are enough difficulties in her history for a lifetime. But when she gets embroiled in Chase's problems - they become her problems too.
Both need to deal with their pasts before they no longer have a future.