I need to know how to get Alec past the security door.
Depends on what you've already done and who's where. What's in your inventory?
All I have is the rope. The girl's on top of the pub and Alec is in the ship.
If you're still stuck on this here's a hint:
Spoiler
Concentrate on getting Suzy inside the ship and to the other side of the security door. She can help from there.