Pain management is a major concern in oncologic breast surgery and reconstruction. Significant risks for acute and chronic pain after surgery might be reduced through improved pain control pre-operatively. Addition of regional anesthesia to a multimodal peri-operative pain management protocol offers a promising solution for improved recovery. For patients undergoing mastectomy with immediate alloplastic breast reconstruction, this RCT compares TPVB+Pecs local anesthetic block with TPVB local anesthetic block and Pecs placebo normal saline block for their effect on acute pain, chronic pain, opioid consumption, opioid-related side effects, patient-reported quality of recovery after surgery, and length of stay.