A Necessary Risk (Harlequin Intrigue #976)

Detective Zach Thomas had one goal: ifnd out what really happened the day his brother died. Problem was he had to involve beautiful scientist Jessica Parker. Then, as Zach slowly uncovered some deadly secrets, his need for vengeance was overshadowed by his desire to protect Jessica. A BUTTONED-UP BEAUTY who'd AWAKENED A KILLER

Jessica Parker knew she'd spent her life doing no harm, and yet somehow the research she'd conducted had gone so horribly wrong. Could her gorgeous protector prevent her from falling victim to an elusive enemy who'd stop at nothing to suppress the truth? Rated '3/5 - Open door' for steam/spice/heat level.