John Murray's book Redemption--Accomplished and Applied has helped me repeatedly over the years. Here is a shorter treatment of the atonement for your benefit.
"The atonement springs from the fountain of the Father’s love; He commends His own love towards us. We must not think, however, that the action of the Father ended with the appointment and commission of the Son. He was not a mere spectator of Gethsemane and Calvary. The Father laid upon His own Son the iniquities of us all. He spared not His own Son but delivered Him up. He made Him to be sin for us. It was the Father who gave Him the cup of damnation to drink. God was in Christ reconciling the world to Himself. Here is love supremely demonstrated." - John Murray