However, my confidence in him, which at one time had rather waned, was fully restored since his belief in Alfred Inglethorp's innocence had been so triumphantly vindicated. 
I was feeling much more sure of Poirot's powers of investigation since he had vindicated Alfred Inglethorp of the crime.
I have never onde doubted Poirot's investigative abilities.
three women are holding signs
a group of people standing at the gate of a building
A large group is waiting
A woman is sitting indoors.
They are sleep
Yesterday I got a call too however, this is a different topic.