Will Nick Burkhardt and Hank Griffin learn the gruesome truth behind Frog Prince in 'Grimm' season 4 episode 16 titled 'Heartbreaker'.Facebook/Grimm

When "Grimm" season 4 returns on NBC with episode 16 titled "Heartbreaker", it might take a break from Nick Burkhardt's (David Giuntoli) family drama and focus more on the storyline between him and Wesen.

The official synopsis and sneak peek images of the fantasy drama indicate that the homicide detective along with his partner Hank Griffin (Russell Hornsby) will investigate a mysterious case of the Royals.

As per the description of episode 16, a cyclist's homicide will introduce the detectives to a Wesen with a tragic fatal touch that will lead the officers to deadly twists and big surprises.

On the other hand, Adalind Schade (Claire Coffee) and Captain Renard (Sasha Roiz) will learn the Royals have stepped up their efforts to find their child.

"Heartbreaker" will also introduce viewers to a new member of the Royal family; the character will be played by New Zealand actor Nico Evers-Swindell.

Meanwhile, several spoilers have stated that the show will revolve around the tale of Frog Prince on 3 April. However, NBC series cannot completely ignore the plot line of Grimm and his lady love Juliette Silverton (Bitsie Tulloch).

So the sequel will have a sequence of the newly turned hexenbiest, who will finally ponder the idea of embracing what she's become as opposed to fighting it.

With Silverton accepting the new change in her life, "Grimm" fans might get to watch some interesting sequences between the power couple in next week's episode of police procedural fantasy series.

NBC will air "Grimm" season 4 episode 16 titled "Heartbreaker" on Friday, 3 April, at 8pm.