Basic facts- no details.
Steph comes back after having the baby and giving it to Dan. She goes off the rails and causes a car accident that ends up killing Ringo.
Paul is pushed by Rebecca but survives. He blackmails her to stay with him by saying that if she leaves him he'll tell the police Declan pushed him.
Finally the three who are leaving (not sure at all how when or why) will be Rebecca, Declan and Zeke.
Please feel free to add more details!