I did some research and found some plotlines and spoilers for Season 6, I am not sure if the are right or not!
6x01 - Epilogue
Danny and Mac get the unexpected help of a young woman while trying to solve their most recent case involving a cop killing.
6x02 - Blacklist Featuring Hangman
The case of a cyber killer, who appears to be targeting medical healthcare workers, turns personal when the suspect invokes the name of Mac's father who had died nearly two decades earlier. Mac has to figure out why the mysterious caller keeps asking questions about his father and how he knows everyone's name....
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