Who's to Blame? (Sweet Valley High #66)
Elizabeth and Jessica Wakefield's parents have separated.  Mr.  Wakefield has moved into an apartment of his own, and the house seems  empty without him.  Elizabeth has never been so miserable.  She would  do anything to bring her family together again.Then Jessica tells  her twin that she thinks their parents' separation is all Elizabeth's  fault!  Distraught and guilt-ridden, Elizabeth decides to move away  from home.  If she really is the cause of her parents' unhappiness,  perhaps they'll get back together once she is out of their way....