The original 'Happy Death Day', released in 2017, was a surprise hit, exceeding all of its studio's expectations. Unsurprisingly, it was soon decided that there should be a sequel, and so everybody involved in the horror film is back for another go.
The original film borrowed heavily from 'Groundhog Day' in that Jessica Rothe's character lived through the day she was murdered over and over again until she found a way to break the cycle and survive. The sequel sees her re-enter that same loop - which makes the 'Groundhog Day' connection almost meta - after the original killer is himself murdered, and a new murderer walks the streets. This time, all her friends are dragged into the loop as well to make things even worse. Director Christopher B. Landon promises that many of the loose ends from the original will be resolved. We can find out for ourselves on February 14th.