Paternal Instincts by Nicky James

At the heart of a missing child case, Quaid and Aslan learn the true nature of fatherhood.
With their baby due any day, Quaid ends up tangled in a case on the last day of work before his parental leave begins. Between eerie ransom notes and family secrets, unanswered questions pile up, twisting the case into something Quaid has never seen.
Someone is lying. Someone knows more than they’re saying.
With the help of supportive friends and colleagues, Quaid and Aslan are determined to solve the case before it’s too late. When their surrogate goes into labor, Quaid struggles to let go and walk away.
A boy has vanished.
A life is in danger.
Can they find the missing child before their baby makes their way into the world?