ITV show The Tower certainly doesn’t pull its punches when it comes to murder. We’ve had disappearances, gruesome deaths, drugs, stabbings — and even cold cases. Tackling it all is London Detective Sergeant Sarah Collins, the no-nonsense police officer who seems to get landed with the worst of the capital.

And this week, she’s back for more as The Tower’s third season gets ready to air on ITV. What can we expect from the upcoming season? Plenty of drama, that’s for sure. Here’s what we know.

Warning: there are spoilers ahead. The series is based on Post Mortem, the first in a series of books from author Kate London, about Sarah. She works for the fictional DSI department.

The first series explored the suspicious deaths of a veteran Met Police officer and a young Libyan girl who fell to their deaths from the roof of a London tower block. Soon after, Constable Lizzie Adama, one of the only witnesses, disappears. Sarah has to search for her missing colleague and solve the mystery of what happened on the tower’s roof.

Season two involved Sarah investigating the 26-year-old cold case of a missing schoolgirl, Tania Mills. After days of searching, Tania’s body is finally found in Morville Park, in the memorial garden planted in her memory by music teacher Adrian Stephenson and Tania’s classmates. It’s then revealed that Tania’s best friend, Katherine (Rosalie Craig) has her own story about Stephenson: that he “persuaded her” to play the violin naked durin.