Where is he?

Robin had gone missing and Batman has no idea where to start looking for him, he asks every villan, he starts to get really worried and Nightwing and Batgirl offers to help him look . They try looking again underground,arkham,villans hideouts, wearhouses, everywhere. and When batman does not sleep when he's looking for him. Nightwing calls for the justice league to help , when they come they help but this time they look in other city's. will they find him or not