Martha and Hugo find out about the bomb under the bus and must defuse it before the timer runs out.
Trey has sen the cops approach and faked fainting, so he's brought to hospital, the bomb bus undiscovered. His mother discovers he's not hurt, gets him to spill his guts, promises to keep silent but betrays him. Hugo got lost and thus accidentally found the bus. John Palmer has worked out Trey's diagram enough to instruct disarming the bomb, but Trey included a secondary mechanism.—KGF Vissers