The message, when decoded, reads "on the rooftop", which is where the door to the warehouse is on the Docks. You need the Chameleon Suit to get past the guards.
opposite direction
The next step would be to get the Chameleon Suit to rescue the first spy. (see related questions)
go to the very bottom
it is on top of the vault
you have to capture a spy first and the spy will give it to u (on the docks)
Find a way to get to the top of the building
You get the Laser pen when you rescue the first spy (at the docks). You need the chameleon suit to get past the guards at the dock. Get the Chameleon Suit and slip past the guards and dogs, then climb over the ceiling to reach the first spy. He will give you a message and the Laser Pen, to help you rescue the second spy on Toupee Terrace.
Spy Island is island #6. After Spy Island is Nabooti Island #7
click on him
"opposite direction"
You get the Laser pen when you rescue the first spy (at the docks). You need the chameleon suit to get past the guards at the dock. Get the Chameleon Suit and slip past the guards and dogs, then climb over the ceiling to reach the first spy. He will give you a message and the Laser Pen, to help you rescue the second spy on Toupee Terrace. (see related question)
There is a large hole in its ceiling. Climb up and enter.