When Cordelia tells Angel that the Beast came out of the ground on the spot where Connor was "born," he starts to think that they are somehow connected.  Wesley pays a visit to Lilah when the Beast appears in the offices.  As is starts it's carnage, the building shuts down trapping everyone inside with the Beast.  Lilah and Wesley escape through a hidden hatch but then Lilah tells him that Connor was left inside.  Angel and the gang must go back into the offices to rescue him.