Gregory Tolliver is a character from the sixth novel in the first series. He is mentioned loaning Shep, Amy and Dan's cousin, a plane, so they can fly to some mines in Australia. Greg and Shep are old friends and "owe" each other many things. 

It is unknown if he is related to Evan Tolliver, Amy Cahill's boyfriend.


In Too Deep

He is mentioned briefly by an officer of having to own a plane.

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