By the time we'd reached the car, the alarm had stopped.

There was a body on the ground, a man dressed in a warden's uniform, crumpled beneath the shredded metal of the car bonnet. As we reached him, I crouched down and put my fingers to his neck in search for his pulse. I pulled away defeated.

'No, no pulse,' I told Nick. 'He's dead.' There was a screech of rubber tyres squealing against the tarmac. I stood up as A.R.C vehicle pull up in the middle of the road. Captain Becker jumped out the truck, swung his gun over his shoulder and ran towards us. I looked down at my watch. 'Jesus, that was quick,' I said.

'Anna, what do you make of this?'

I watched Nick pull something from the twisted wreckage of the car roof wedged within the rubber seal of the broken windscreen before he tossed it towards me. I held it up. 'Crocodile tooth,' I returned. 'We know its heading for the river, right, but a crocodile will usually drag its victims into the water to finish them off.'

'So why did this one attack on dry land?' The captain asked.

'And why has it been walking on two legs?' I exhaled slowly. 'The anomaly's Eocene epoch… I swear I know it…'

'How long did you spend in the Paleogene?'

I shrugged, 'a month… why?'

'Because you talked about it. You saw this creature and you didn't know what it was so you drew it, to try and remember.'

I nodded, starting to remember, 'you're right. It's that same one I put through the system. Oh god…' the word was on the tip of my tongue. 'What was it called?'

My phone buzzed again. This would be Connor. He'd found out what it was, but somewhere between pulling the device out of my pocket and answering the call, the word came to me.

'Pristichampsus.' On the other end I heard Connor hum. 'You worked it out,' he said.

'Just,' I replied. 'I think our database is wrong. We would have got there a lot sooner otherwise. We assumed it was an aquatic reptilian quadruped because it has four legs but predominantly it uses two which means it's probably an amphibian mammal. '

'Have you found it?'

'Sort of… I'll call you back.' I hung up again and looked back to Nick. 'How far is the river from here?'

He tilted his head. 'Half a mile? What are you thinking?' he asked.

'Doesn't matter where it goes in, only where it gets out,' I stated, 'and it's not gonna be in there for long, the water here will be far too cold for it, so it'll come back ashore looking for warmth.'

'You mean anywhere along the whole stretch of river?' The captain clarified. When I nodded, he groaned.

I looked down at my watch, and quickly did the maths, then I echoed his frustrated gesture with my own groan. 'There's more,' I said.

'What?' Nick asked.

'Well… crocodiles consume about a quarter of their body weight in a process of gorging, they can control their heart valves neurologically which means they bypass blood from the lungs straight to the stomach so that they secrete gastric acid and digest by paracellular absorption over 10 times quicker than any other animal. They gorge, they pass, and the whole process starts again.'

'What are you saying?'

'It didn't eat Marian,' I stated, 'and it hasn't eaten this guy so we can assume it was full when it got here, but the anomaly opened three hours ago. And with water that cold she's gonna be using up energy much faster. By the time it gets out the water, there's no way it won't want to eat again.'

'We need to get down to the river.'

I didn't say anything when Nick pulled out the binoculars from his jacket pocket again and stood with his back to us at the top of the steps down to the Thames.

Captain Becker found a wall to lean against, swept his bottom lip into his mouth a chewed down on it nervously as he waited for Cutter to report.

At the top of the steps, opposite the captain, I leant back against the parallel wall.

It had been about 15 minutes. With every second longer I started to get more worried that we'd been too slow and already missed it.

When I looked up from my shoes, I found Captain Becker's gaze was already on me again.

'What?' I asked.

He raised an eyebrow and turned his head away.

I thought that would be it. That the gesture was enough for him and we'd settled back into a pedestrian silence but then finally he spoke. 'Are you okay?' he asked.

At the insinuation, Nick whipped his head around, looked me quickly up and down, then frowned. 'Yeah,' I replied in confusion. 'I'm fine,' I added, more for Nick's sake than his. 'Why?'

I was still trying to gage Captain Becker.

It had only been a few hours.

First, he'd made it super weird. Then, he'd made it rather awkward, and now, I wasn't sure what he was doing like he didn't know where he stood with me either.

It had taken me months to get used to Jensen. Then again, the whole Jensen and Ryan thing had made it complicated.

I'd known within minutes that I hadn't liked Lester. Little had changed there, except our tolerance towards one another.

There was that something about him that I still couldn't work out. I assumed it had something to do with the fact he was a soldier, and as a scientist we were made differently.

Before I had the opportunity to again clarify why he was asking me if I was okay, Nick had called my name, lowering his binoculars to point all the way across the Thames to the bank on the other side of the river. I followed his line of vision. 'What's that?'

I answered by pushing myself off the wall and making immediately for the car. She'd come out the river. 'We've got to go.'

I tracked the creature up from the bank and towards an office building off the riverbank. Jensen met us there with back up.

There was a trail of overturned chairs and lopsided table leading up to a broken window and as we stepped inside over the broken glass I slipped on some of the shards. They skittered against the tiled floor.

Nick was behind me. His arm whipped out, grabbing me under the elbow to stop me from going down and quickly plonked me back on my feet.

We made our way through the café, towards the exit that led into the centre.

The screaming brought us to a staircase. The people flooded down it and jostled against us, Jensen called out, trying to calmly bring about an order to the madness but they were too afraid to listen and instead we had to wait until they were gone.

'Up the stairs?' I gestured to the staircase, just wanting to check that Nick was coming too, and he nodded back at me.

'Yeah.'

I took them two at a time.