You thought it was the back-to-school season, but according to ABC, it is murder -- not class -- that is back in session.

The network released the "How to Get Away with Murder" Season 5 trailer on Thursday, and, of course, there's another mystery in store for us this season. The first half of the preview starts out on a positive note as Annalise (Viola Davis) inspires a new crop of students and Connor (Jack Falahee) and Oliver (Conrad Ricamora) start planning a wedding. However, we soon get a rude awakening: It looks like there has been another murder.

Watch the trailer below and prepare for what the video description calls "another crazy-twisty season."

The show brings back returning stars Davis, Falahee, and Ricamore, as well as their co-stars Billy Brown, Aja Naomi King, Matt McGorry, Karla Souza, Charlie Weber, and Liza Weil.

"How to Get Away with Murder" Season 5 premieres Thursday, Sept. 25 at 10 p.m. ET/PT on ABC.