Grimm: Season 3, Episode 4

3 - 4: One Night Stand

When Nick and Hank investigate a drowning death with mysterious marks on the victim’s ankles, they happen to stumble upon a group of water-bound Wesen with a deadly postcoital cuddle. Meanwhile, Rosalee starts unpacking her things at Monroe’s, and Captain Renard makes a startling realization about the possible identities of the Royal Baby’s parents.