Found
AN: Yes, this is very similar to A Nation's Betrayal. Forgive my lack of imagination, though, because I think this is better.
Disclaimer: If I owned Alex Rider, Sabina would never have existed.
The blond boy crouched under the bridge, shivering in fear and fatigue. As he waited there to regain his breath, his mind raced, trying to think of a way to escape the people hunting him. His disappearance would have to be thorough. Any sign, even the slightest hint that he was alive would send them after him, unrelenting, like hounds chasing a fox. He dreaded to imagine what would happen if they caught him.
All too soon, the footsteps were back. He recognised their deep voices, soft as velvet, calling him, trying to lure him out. Finally they stopped, right in front of him. He ran.
Through the dark and dank streets he raced, weaving round corners and dodging the lights they shone at him. His heart beat harder, struggling to supply his muscles with the oxygen-rich blood to keep them going. His legs were already burning, screaming in pain as he pushed them to their limits.
He should never have gone after them. MI6 hadn't told him to investigate. But he hadn't been able to resist. Suspicious circumstances and the perfect opportunity had once again led to his curiosity getting the better of him. And just like the cat, it would probably kill him.
Tom and Sabina had both been adamant he stay away. Unknowingly, they had echoed each other, telling him that this time it was different. That they weren't like the villains he normally faced. Stupidly, he'd dismissed their warning, arrogantly assuming that after the events in Egypt, he had overcome his weaknesses. He'd reasoned that Tom and Sabina just didn't understand.
Then the people had come for Tom. He'd found the boy one night, to check up on him as he hadn't been returning any calls or messages. The younger boy had been placed in the hallway before his front door, arms spread wide in the position of the crucifix. Tom's parents and visiting brother were piled beneath him, their bodies drained of blood.
When Sabina had been found in the entrance hall of her school, body also empty of the life-giving liquid, Alex knew he had to run.
And so here he was, crouched under another slime-covered bridge. The blood rushing through his nervous system made him feel light-headed. His body, pushed to exhaustion, had collapsed and with his last vestiges of strength, he had heaved himself under in what he knew was a futile attempt to hide. The polished shoes clicking on the cobblestones concluded their journey to rest in front of him and he knew he'd failed. He had been found.