If you like Tess Gerritsen, then try these authors:
• Robin Cook
• Lisa Gardner
• Patricia Cornwell
• Elizabeth Lowell
• Kathy Reichs
• Tami Hoag
• Gwen Hunter
• Alex Kava
• Lisa Scottodline
• Michael Palmer
• Leonard Goldberg
• Sarah Andrews
• Susan Dunlap
• Sarah Lovett
• Leah Ruth Robinson
• Marianne Wesson
• Beverly Connor
• Harlan Coben
• Karin Slaughter
• Darian North
• Mary Kittredge
• Jonathan Kellerman
• James Patterson
Suggested titles:
Moving Target by Elizabeth Lowell
206 Bones by Kathy Reichs
Undone by Karin Slaughter
Blow Fly by Patricia Cornwell
Monster by Jonathan Kellerman
Hope this post helps.