As Philip and Lukas find haunting proof that the killer's alive, Helen struggles not to let the case affect her marriage with Gabe. Meanwhile, a new head of the FBI task force is revealed.

Helen seeks Agent Kamilah Davis's help in tracking potential witness Bella. Meanwhile, the boys skip school and escape to a NYC club that isn't anything like Lukas expected.

As Ryan attempts to shut down her case, Helen and Gabe's marriage is tested when her suspicions lead Philip to reveal a deep secret. Lukas creates a scandal to bury gay rumors at school.

Ryan is forced to interfere with an autopsy as Helen gets closer to the truth. Philip deals with a surprise visit from his mom, and Lukas struggles with anxiety about the cabin murders.

As Helen looks for the murder weapon, Kamilah pulls her into a desperate search for Sita. Lukas is on the verge of his dream sponsorship but it requires an act of betrayal to secure the deal.

Lukas and Philip embrace their romance, Helen discovers new evidence that the cabin shooter is still alive, leaving the murder board still up and the killer on edge. Helen seeks help to protect Lukas.

Ryan romances Kamilah to get close to Lukas. As she tracks the killer, Helen develops an unexpected emotional connection with Ryan. Meanwhile, Gabe uncovers a clue to his wife's mysterious past.

Ryan tries to cover his tracks; and Helen's past threatens her marriage as well as her ability to protect her family.

Helen reels from her discovery that Ryan is the killer. When she learns Philip and Lukas are missing, she must race to find them before it's too late...