Preferred Contractors (PC) was a general contractor and owner of a condominium complex that was under construction. Barrett, a subcontractor, had been hired by Henderson Plumbing, another subcontractor, to help it complete the plumbing work on the project. When Henderson began using shoddy installation procedures and subsequently fell behind the scheduled completion time for the project, PC urged Barrett to correct Henderson's mistakes and to finish the job. Barrett refused to continue until he knew who would pay him, since he feared Henderson's financial position was shaky. Nonetheless, PC's job superintendent told Barret to go ahead even if Barrett and PC had no contract because he would use his influence to try to help Barrett get his money. Barrett finished the work and sent a $7500.00 bill to Henderson which was never paid. When Barrett later sent the bill to PC, these facts emerged: PC told him that due to Barrett's failure to notify PC promptly of Henderson's non-payment, PC had already paid Henderson in full and therefore would not pay twice for the work.

Discuss the best possible theory of recovery Barrett may argue and the elements of the same.