What impulses define who we really are? As Connie and Tristan settle into their participation in a clinical drug trial, they begin to fall in love. But how can they be sure it鈥檚 the real thing and not an exhilarating side effect of the new antidepressant they鈥檙e taking? The supervising doctors begin to ask themselves questions too: where do they draw the line between love and ethics?