Nancy Grace will discuss new developments in the Haleigh case tonight What is Misty hiding? "Investigators ramp up their search for missing Florida girl Haleigh Cummings while the key witness in the case, Haleigh's stepmom baby sitter Misty Croslin, is finally back in town after going AWOL! What does she know about the night Haleigh vanished from her home and will new pressure tactics from police get her to tell all? Plus, detectives follow up on a tip delivered to a newspaper, but it leads them back to square one! Nancy Grace has the latest breaking developments, 8 & 10 p.m. ET on HLN. "