The suicide theory seems far-fetched to me. Who on earth would believe that Allison would walk 2-3 hours to a bridge to jump off? Wouldnt GBC have made it more believable by abandoning the Captiva out at the bridge, thereby making it seem Allison had driven there and then jumped? So in that vein (and yes I know -its the roundabout again!)is it possible that Allison didn't die at the house? Maybe they argued, it got very ugly and she fled in the Captiva? Gerard took off after her? So now there is two cars going through the roundabout... erratically as was reported. Was he trying to pull her over? He finally gets her to stop at Kholo Creek, the arguing gets worse and he strikes and pushes her over. She dies where she falls. Now GBC has two cars out there. Is this when NBC is called upon? NBC drives to Kenmore, leaves his car in the shopping centre carpark and GBC goes back to pick him up. They both drive back to the bridge in the Prado, then NBC drives the Captiva while GBC drives his vehicle and they take the vehicles back to GBC house. Then GBC drives NBC back to Kenmore to collect his car and possibly dump any evidence in the industrial bins. Just trying to figure out why the police were so interested in WHO was driving what cars at that roundabout?