The reality show presented by Mónica Naranjo, in which six couples will live three weeks of madness in a spectacular villa in an idyllic setting. All contestants claim to have an honest relationship, but now they will have to prove it. Throughout the reality show, the contestants' lies and truths will be revealed, as they will all be subjected to the "eye detect'', a revolutionary detector that analyses the involuntary alterations that occur in the eye when lying. The couples will compete for a cash prize of up to 100,000 euros, knowing that, in Amor con fianza, lies have a very high price...Telling the truth, however painful it may be, will earn them money, but if they lie, the amount they own will automatically decrease.