"Harley Quinn created by Paul Dini and Bruce Timm"--Title page.

"Originally published in single magazine form in DETECTIVE COMICS 831, SHOWCASE '96 3, NIGHTWING/HUNTRESS 2, GOTHAM CENTRAL 6, BATMAN 567, CATWOMAN 16, BATMAN VILLAINS: SECRET FILES AND ORIGINS 1, BATMAN: GOTHAM CITY SECRET FILES 1, BIRDS OF PREY: SECRET FILES AND ORIGINS 1, BATMAN: NO MAN'S LAND SECRET FILES AND ORIGINS 1".--Colophon.

Kind of like family (featuring Harley Quinn from Detective Comics #831) / Paul Dini, writer ; Don Kramer, penciller ; Wayne Faucher, inker ; John Kalisz, colorist ; Jared K. Fletcher, letterer -- Birds of a feather (featuring Black Canary from Showcase '96 #3) / script, Jordan B. Gorfinkel ; layouts, Jennifer Graves ; finishes, Stan Woch ; colors, Dave Grafe ; letters, Ken Bruzenak -- Thicker than blood (featuring Huntress from Nightwing/Huntress #2) / Devin Grayson, writer ; Greg Land and Bill Sienkiewicz, artists ; Noelle Giddings, colorist ; Jamison, separator ; John Costanza, letterer -- Half a life, part one (featuring Renee Montoya from Gotham Central #6) / words, Greg Rucka ; art, Michael Lark ; letters, Willie Schubert ; colors, Matt Hollingsworth -- Mark of Cain, part one (featuring Cassandra Cain from Batman #567) / Kelley Puckett, writer ; Damion Scott, penciller ; John Floyd, inker ; Greg Wright, colorist ; Todd Klein, letterer -- Relentless, part five (featuring Black Mask from Catwoman #16) / Ed Brubaker, writer ; Matt Hollingsworth, colorist ; Cameron Stewart, artist ; Sean Konot, letterer -- Character profiles.