The screeching noise was the first thing she heard. It sounded as if it had started some distance away, but it was hard to tell because of the rest of the din going on around her. Jessica quickly looked to her right as a black car squealed across the junction, wheels locked, spinning on the drenched surface. Everything seemed to happen in slow motion, the vehicle twisting a full circle and smashing into a lamppost in the centre of the junction before being hit by a blue car coming from the opposite direction and completing another half-spin.

Jessica blinked, trying to take in what she had just witnessed. For a fraction of a second, it was as if everything had stopped, even the rain. Without thinking, she switched off her engine and got out of the car. She didn’t say a word but Rowlands was moving too and together they dashed across to where the mangled car had come to a halt. Jessica headed for the black vehicle, Rowlands towards the blue one.

Jessica could feel her heart beating quickly as she arrived at the wreck. There was a huge crack in the windscreen, the deflating airbag pressed against it. Car horns blared around her and other people were approaching the car. Jessica took out her police identification and shouted for them to stay back, at the same time pointing at a man who had his phone out and telling him to dial 999.

Because of the way the car had spun, it hadn’t entangled itself with the lamppost, instead bouncing after being hit by the other car. Jessica moved to the driver’s-side door, trying to peer through the cracked glass. The mixture of rain and condensation made it hard to see through the other windows and she took a snap decision to open the door. As she did, a splash of dark red blood from the inside dribbled onto the ground; the cream material lining of the seat was also drenched.

Jessica knew instantly the driver was dead.

The blood-soaked airbag had begun to sag onto the driver’s lap as Jessica finally allowed herself to look at the victim. She had seen plenty of dead bodies in her time but this one was a distorted mess. Jessica quickly realised why: the seatbelt clasp hung limply by the door, unfastened. She felt a shiver go through her as it started to rain again, droplets of water streaming down her face as she tried to put the pieces together. Despite the mess, the driver’s greying hair made him look as if he was in his fifties. She didn’t know for sure but it appeared that his neck had snapped. It could have been him hitting the windscreen or the force of the airbag colliding after the impact. Not that it mattered considering the way the pulped skin, blood and glass made his face look like a warped, dropped pizza. Jessica could not look for more than a second or two. Not wearing a seatbelt had cost him his life.

Jessica shut the door, knowing there was nothing she could do and not wanting to contaminate the scene either through her own presence or by letting rain in.

She again warned members of the public to stay back before walking the short distance to the blue car where Rowlands was crouched, talking to a young woman still sitting in the driver’s seat. As Jessica came closer, it was clear the woman was crying hysterically, a seatbelt stretched across her. She reached the car and put a hand on Dave’s shoulder, shaking her head slightly to let him know the fate of the other driver before crouching herself.

Rowlands spoke slowly and deliberately. ‘This is Laura. She was on her way to work, weren’t you, Laura?’ The woman nodded, eyes wide with disbelief as tears continued to flow down her face. Jessica knew her colleague was doing his best to keep the woman calm, using her name frequently to keep her attention until help arrived. Outwardly, aside from long dark hair which was tousled across her face from the impact, the driver looked fine, but she was obviously suffering from shock.

‘Are you okay, Laura?’ Jessica asked. The woman nodded again but said nothing.

Jessica left Dave talking as cars swerved around the accident, sirens blaring in the distance.

She stopped to take a deep breath, swallowing a feeling of claustrophobia despite being in the open. The car horns and engines, the chatter of nearby pedestrians, the patter of the rain: it was becoming overpowering. Jessica felt a few drops of rain slide down her neck, struggling not to shiver as she made her way back towards the black car while tying her long hair into a ponytail.

The vehicle looked much more of a mess from the other side. It was a mid-size four-door model that Jessica thought of as always being advertised with a family sitting inside, as if the machine itself was the key to parenting bliss. A scrape ran the full length of the passenger side, the front headlight a concertina of mangled metal.

Jessica blinked the water away from her eyes as she saw the flashing lights of an ambulance a few hundred metres away, the noise from the siren blaring ever louder. Her eyes were attracted to the rear of the vehicle where the car’s boot had popped open ever so slightly. She put a hand on the metal, at first thinking about pushing it shut, but curiosity got the better of her and she opened it instead.

If she’d had to, Jessica would have struggled to guess the contents of her own boot. There might well have been jump leads and possibly a petrol can but she wouldn’t have put money on it. She definitely wasn’t prepared for the sight that met her in the rear of the smashed-up black car. Thick plastic sheeting was wrapped tightly around an object with heavy-looking tape sealing it into a tight cocoon. Next to the object was a rusting spade with a muddied plastic handle. Jessica felt something in her stomach urging her forward as if she already knew what it was.

She pushed the boot down but didn’t lock it in place. As the ambulance drew up, she ran to her own car, opening the driver’s door and digging into the well before pulling out a pair of scissors.

Her father had always been good about keeping things in their old family car just in case but Jessica hadn’t inherited his forward thinking. She had found the scissors not long after her dad bought her the car second-hand a decade or so ago, left by the previous owner. She dashed across the junction again, silently thanking whoever that previous owner was and feeling justified for never cleaning out her car.

As she arrived back at the black vehicle, paramedics stepped out of the ambulance. Jessica flashed her identification and told them the fate of the driver. One of them went to check on him anyway as another walked to where Rowlands was still comforting the woman from the blue car.

More sirens blared in the distance as Jessica returned to the black car’s boot, opening it and moving the spade to the rear of the compartment out of her way. Layer upon layer of plastic sheeting was wrapped tightly around the object and Jessica struggled to force through the blunt blades of her scissors. As she pushed harder, it started to rain more heavily, huge drops bouncing off the tarmac road. Jessica could feel the force of the water smashing into the top of her head. She continued to cut and finally felt the scissors push through the top few layers of the plastic. Reaching in with her hands, she pulled hard to try to tear the material apart. Slowly, it began to give and, with a combination of her hands and the scissors, she opened up part of the wrapping.

With the plastic pulled back, all she could see was a piece of cloth that had a flowery pattern. It reminded Jessica of the curtains her parents used to have at their house when she was a child, a hideous mixture of yellow and brown. Still reaching into the boot, Jessica tugged at the fabric, finally freeing it with a gasp.

Jessica tried to force herself to look away but the pale skin and clamped eyelids held her hypnotically: the haunting lifeless face of a dead child.