Legendary Siamese twins Chang and Eng have inspired such novels as Darin Strauss's Chang and Eng (Dutton, 2000) and Mark Slouka's God's Fool (Knopf, 2002). This summer brings a twin-lit revival, with three more fictional tales of literally inseparable characters.

Half Life by Shelley Jackson (HarperCollins, July) The Girls by Lori Lansens (Little, Brown, May) Ludmila's Broken English by DBC Pierre (Norton, May)
Twins in question: Nora and Blanche Olney Rose and Ruby Darlen Blair and Bunny Heath
Synopsis: In a not-too-distant future, one twin plots to kill the other. Pushing 30, the twins look back on their lives in smalltown Ontario. The twins (male) meet up with a Russian mail-order bride in terror-struck London; misadventures ensue.
Where they're joined: Collarbone Head Trunk
Do they separate? Read to find out No Yes
Marketing angle: Middlesex meets Geek Love Gothic Canadian Globalization and its misfits