The key of the season has truly been found!  Carrie finds out that her son is actually alive and well, and she tries to crash into his life by having an affair with his father.  David and Sarah agree to pursue a secret relationship, since Hillary disapproves.  What could go wrong?  Two suspects in Teri's murder are identified: Hillary because Teri received a threatening note about leaving and was seen fighting with Teri on the balcony, and Carrie who had flashbacks of fighting with Teri on the balcony.  The message: don't fight on balconies.