Plot summary
Lucy uses her ghostly state to wake Joseph and ask where he hid the Darkhold. Coulson arrives and is able to learn of this before Joseph dies from her "infection". Coulson decides to use Morrow against Lucy, but doesn't tell Mace. The latter, whose public approval was already high after heroics during a bombing in Vienna, becomes more popular after he reveals his Inhuman status in a television debate with Nadeer. However, Simmons threatens to reveal the truth about his Vienna actions and he agrees to exempt her from any lie-detection tests.
At the prison, Lucy infects the staff, who attack Coulson and May. Daisy saves them while Mack and Reyes break out Morrow. Reyes confronts the last member of the "Fifth Street Locos" gang who paralyzed Gabe in a paid hit. Reyes loses control and the Ghost Rider kills the prisoner. This allows Lucy to kidnap Morrow, whose help she needs. Mace secretly meets with Nadeer and agrees to help her when she blackmails him with footage of the Ghost Rider's actions while working with S.H.I.E.L.D.
Credits
Adapted from Wikipedia contributors, Agents of S.H.I.E.L.D. season 4. HTML formatting and reference markers removed.