Cassie and Sam decide to take a step forward, but his pushy ex-wife stalls them at the starting gate. Grace preps for the teenage rite of passage -- her driving test.

The arrival of a man from Cassie's past may complicate her burgeoning relationship with Sam, but that isn't the only bump in the road - Sam's intrusive ex-wife Linda is still trying to keep Cassie out of the picture in a desperate attempt to repair their fractured family.