“Heart of the Holidays” “Below Deck”

“L.A.’s Finest” (8 p.m., FOX): The team digs further into their investigation of the missing diamonds in the new episode “Dangerous Minds,” and the task force pulls off a risky drug bust. Elsewhere, both Syd and McKenna (Gabrielle Union, Jessica Alba) must confront some of their deepest secrets yet as the threat of Knox continues to hang over their heads. Duane Martin, Zach Gilford and Ernie Hudson also star; Laz Alonso, Rebecca Budig, Jake Busey and David Fumero guest star.

(8 p.m., Hallmark): As a child, Sam (Vanessa Lengies) dreamed of growing up and making the world a better place. Now, however, she’s living in New York and working as a powerful Wall Street stockbroker, a job that has led to a huge shift in her personal priorities. A misunderstanding prompts Sam to return to her rustic hometown to spend the holidays with her family.

(9 p.m., Bravo): Carrying the weight of the whole deck team on his shoulders starts to take a toll on the good-natured Eddie in the new episode “Do Not Disturb.” Newbie James, feeling like a fish out of water, struggles to connect with his crewmates. Mistakes from a few people fracture the charter, and Captain Lee is forced to lay down the law to his crew after a series of dangerous mishaps.