This was who Walker called in a crisis?

Walker called for a vote of no confidence in Syvret.

When they were anchored and had eaten dinner, Walker called his council of eight together for a final conference.

Add the fact that Walker has called this meeting.

Walker repeated only the surname, then went to the door and called Skye in.

Walker had called her intrepid, but she was feeling decidedly cowardly.

Shortly after the trade, Walker called his brother, not just to share the news, but also to cancel the fishing trip they take every October.

Walker didn't call to me, but I heard his voice in my mind, as well.

Then Walker called my cell with some preliminary feedback from the search at her house.

And as the Walker called his long summons of the Dark, the hall itself began again to change.