| Issue | #10 |
| Published | May 2010 |
| Frequency | Monthly |
| Cover Price | 2.99 USD |
| Pages | 36 |
| Editing | Mike Marts; Janelle Siegel (assistant) |
| Notes | U.S. on sale date: 2010-03-31. Copyright © 2010 DC Comics. |
| Characters | Catwoman [Selina Kyle]; Harley Quinn [Harleen Quinzel]; Poison Ivy [Pamela Isley]; Riddler [Edward Nigma] |
| Genre | Superhero |
| Pencils | Guillem March (signed) |
| Inks | Guillem March (signed) |
| Colors | Guillem March (signed) |
| Characters | Catwoman [Selina Kyle]; Harley Quinn [Harleen Quinzel]; Poison Ivy [Pamela Isley]; Riddler [Edward Nigma]; Commissioner James Gordon; Rachel (flashback); Dr. Aesop (villain); Hush [Thomas Elliot] (cameo; villain; flashback); The Broker [Sherman Fine] (cameo; flashback; villain); Calliope (villain); Clio (villain); Erato (villain) |
| Synopsis | The Sirens use the Riddler to find out who killed Rachel. |
| Genre | Superhero |
| Script | Paul Dini |
| Pencils | Andres Guinaldo |
| Inks | Raul Fernandez |
| Colors | Ian Hannin |
| Letters | Sal Cipriano |
| Script | Ian Sattler |
| Letters | typeset |
| Notes | Brightest Day checklist for April to June 2010. |