Her years of research and sleepless nights are about to pay off . . . if she can stay alive.Dr. Ivy Collins, founder and CEO of Hedera, Inc., is ready to begin clinical trials of her company's cutting-edge prosthetic. Her work has been praised by government, medical, and advocacy groups, and everyone hopes the device will be a success. Well, almost everyone. Someone is trying to sabotage Hedera and the launch, but to what purpose--and how far will they go to get what they want? Meanwhile, US Secret Service Agent Gil Dixon can't believe he's finally been reunited with Ivy, his childhood best friend. Now that he's found her again, Gil intends to mend their broken relationship. But it will take all his skill to uncover the truth in time to save Ivy's life, her life's work, and the innocent lives caught in the crossfire.Praise for Unknown Threat"By far the best romantic suspense book I have read this year!"--Write-Read-Life"Unknown Threat by Lynn H. Blackburn is a fast-paced romantic suspense read. I loved the action-packed scenes."--Urban Lit Magazine"Wow, talk about an intense and riveting read. I think this is my favorite book by Blackburn to date."--Relz Reviewz