I think your right.
I've cracked the Location (The easy bit), and am pretty sure i know what a J-59 is, and how it helps you track down.....
The source of the Invisible Love poem is a bit of a sticking point though!
I think i might know what the Invisible Love Poem bit refers to, though it's a bit tenuous - though i'm not sure how the source relates. It's not clear to me, so i suspect my ILP thinking is wrong.
I'd love to know what your thinking is related to the 'Source' clue!
Regards,
Richard...