Thomas Magnum (Jay Hernandez) and Juliet Higgins (Perdita Weeks) are going on a new mission in the upcoming Magnum P.I. season 3 episode 7. The latest case is quite dangerous for the duo as they're about to investigate a "shady person" who turned out to be a serial killer.

In Magnum P.I. season 3 episode 7, Magnum and Higgins will be investigating someone living on their block. The overenthusiastic neighborhood watch group asked the duo to find out what this person might be hiding from everyone. The situation gets dangerous when they learned that there's a serial on the loose.

This week's episode is titled "Killer on the Midnight Watch," which is a reference to what Magnum and Higgins are currently investigating. Based on the promo, the two infiltrated a house to get some information about the shady character in the neighborhood.

Magnum and Higgins entered the house successfully, but their problem didn't stop there. As seen in the clip, a guy went inside prompting the two to hide inside the closet. They need to be as quiet as possible since one wrong move could jeopardize their investigation.

This man is seemingly the "serial killer on the loose" in Magnum P.I. season 3 episode 7. The problem, however, is that the two must escape their current situation first. This is something that the duo must figure out before the guy finds out where they're hiding.

Both Magnum and Higgins will utilize their skills to get out of this predicament. The former could apply the things that he learned during his military training, while the latter could use her skills while in she's the MI6. Their friends from the outside will do their best to help them, as well.

Beyond this investigation, Magnum P.I. season 3 episode 7 will see Higgins' relationship with Dr. Ethan Shah (Jay Ali) continue to play out. In addition, her recent authority-figure role is something that needed to be fleshed out.

Elsewhere, Jin (Bobby Lee) is going to have his own storyline. He started his new money laundering business, something that comes with several complications. Yet, his new venture has led him to want to help a new friend.

Magnum P.I. season 3 episode 7 airs on Friday, Feb. 5, on CBS. The series is also available on CBS All Access and the network's official website. Moreover, it can be streamed on Directv, Tubitv, Fubo TV, and YouTube TV. For Amazon Prime Video subscribers, previous episodes are available to rent or purchase.