How do you get to the third spy on spy island?

Answer:
The third and final spy is on the Rooftops above the Grease Monkey garage on Balding Avenue. To reach her, you need the Grappling Bowtie from the second rescued spy.

(see related question)
First answer by Dfoofnik. Last edit by Dfoofnik. Contributor trust: 2550 [recommend contributor recommended]. Question popularity: 3 [recommend question].