Kate DiCamillo meets Lemony Snicket in this darkly comic novel about two sisters who learn they are each others' most important friend!Imagine two twin sisters, Arabella and Henrietta--nearly identical yet with nothing in common. They're the best of friends . . . until one day they aren't. Plain and quiet Henrietta has a secret plan to settle the score, and she does something outrageous and she can't take it back.*When the deed is discovered, Henrietta is sent to live with her eccentric great-aunt! Suddenly life with pretty, popular Arabella doesn't seem so awful.*And, though she's been grievously wronged, Arabella longs for her sister, too. So she hatches a plan of her own and embarks on an unexpected journey to reunite with her other half.