Undercover Passion by Melinda Di Lorenzo

He’s not who he says he is. But he’s her only hope.

Undercover detective Harley Maxwell has spent years tracking a master criminal. And the key to capturing his arch rival lies with single mum Liz James, who might be aiding his target. Making Liz talk — by getting close to her — could also unravel a connected mystery that’s haunted Harley for years. But when her young daughter is kidnapped, getting the girl back is all that matters.