Bentley needs blueprints to the spice factory, but Rajan has them. If the blueprints are read together they will tell everything about his spice operation. But he doesn't have that section of the Clockwerk Heart, they saw during the recon. Sedate Rajan with Indian watermelons and steal the blueprints.
This is the only Sly Cooper level to have red markers which mark where the watermelons are.