Checkpoint 9 clue

Is it safe? In the novel Marathon Man, one of the characters is referred to by two different names. If the character referred to as Scylla is also the same character as:

Doc, Source Figure is Checkpoint 9.
Babe, Handstand is Checkpoint 9.
Janey, Alchemy of the Human Spirit is Checkpoint 9.

Checkpoint 9 can be found near the intersection of Hope and 4th.

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