This story is from a very touching movie which I watched many years ago. I obtain the original story through wikipedia and share with you.
In medieval Europe, a peasant thief Phillipe, who escapes from a dungeon, is saved by a strange knight in black. The knight is identified as Eteinne Navarre. Navarre, a quiet man who travels with a companion hawk, tells Phillipe that he intends to ride back to the city Aquila and to kill the evil Bishop. Navarre reveals very little about his background or motivation. Phillipe reluctantly agrees to take Navarre back only when Navarre passively threatens to kill him if he refuses. On the long journey back to Aquila, Phillipe starts to notice that Navarre disappears at night, while a wolf seems to always be prowling in his absence. He also notices that the hawk disappears at nighttime, and a beautiful woman, Isabeau, manifests out of nowhere each evening.
Bishop’s men capture Phillipe one night and use him to find Navarre. They battle and Navarre manages to defeat the Bishop's guards, but both he and the hawk are severely wounded. As the hawk barely clings to life, Navarre seems broken. Navarre looks to the sunset and orders Phillipe to travel down a nearby road to an old monk named Imperius who will "know what to do." Phillipe finds Imperius, who heals the wounded hawk. Imperius then tells Phillipe a story that confirms what he already suspects. Years ago, Isabeau, a young French beauty, fell in love with Navarre, the captain of the guard. The Bishop saw Isabeau and fell in love with her but Isabeau "sensed his wickedness" and rejected his advances. Imperius reveals that in a drunken confession it was he who informed the Bishop of Isabeau's love for Navarre. Enraged with jealousy, the Bishop made a pact with the Devil to place a transformation curse upon both the lovers, swearing that "if he could not have her, then no man would". With the curse in effect, Isabeau becomes a hawk during the daytime while Navarre becomes a wolf during the night. They are eternally apart and only see each other for the briefest of moments during sunset and sunrise.
Three of the Bishop's guards arrive the next day and storm Imperius' castle. Phillipe manages to get Isabeau away but they are both trapped by the guards on top of a tower. Navarre arrives in human form to save Imperius, Phillipe and Isabeau (who is now a hawk). Imperius says that he has found a way to break the curse, explaining that in three days, there will be a "day without a night. A night without a day." During that brief moment, he and Isabeau will both be in their human forms, and must confront the bishop together as man and woman to break the curse. Navarre refuses to accept Imperius' suggestion as the monk had already betrayed Isabeau and Navarre before when he told the Bishop of their love.
Meanwhile, the Bishop concocts a plan. As he seems unable to kill Navarre in his human form, he instructs a hunter, Cezar, to trap wolves, hoping to actually kill Navarre in his wolf form during the night. Isabeau sees the wolf pelts on Cezar's horse and she rides into the forest to save Navarre from Cezar's deadly traps. Cezar sees the black wolf in the forest, but before he can get to Navarre, Isabeau kicks him to the floor and he falls into one of his own traps and is killed.
Phillipe tells Isabeau of Imperius' plan. Phillipe, Isabeau and Imperius develope a plan to trap Navarre when he is in his wolf form so that they can prevent him from killing the Bishop before the day that Imperius has told him to confront him on, the "day without a night". Phillipe and Imperius dig a hole to trap the wolf in while Isabeau tries to summon him, but before Navarre can reach the trap he falls through the ice crossing the river. Phillipe jumps into the water to save him. The next morning, Isabeau in her human form awakes alongside the wolf in the hole that they had dug to trap him in. The sun rises and Navarre transforms into a human. The two lovers see each other for the first time in years, but before they can reach out to touch one another, Isabeau transforms into a hawk. Navarre learns that Phillipe saved his life, and he finally agrees to follow Imperius' plan.
Navarre and company continue on and reach Aquila. Navarre is still sceptical about Imperius' "night without a day, day without a night" theory, but Imperius' says that he must confront the Bishop now or the curse will never be broken. Navarre orders the monk to kill the hawk should he not return in a certain time period, for this will likely mean his quest has ended in death and he will then meet Isabeau again in the afterlife. Using Phillipe's knowledge of the prison inner workings, Navarre enters the city and finally the cathedral. Just as he is about to kill the seemingly defenseless bishop, Navarre looks outside and sees the eclipse, the "day without a night, a night without a day". Navarre realizes that Imperius was right, however, the time period for him to return is over and so he assumes that Isabeau is already dead, whether the spell actually could be broken or not. Navarre is set to kill the bishop when Isabeau walks in - appearing in human form. Everyone present is awestruck. By looking at the both of them, the Bishop breaks the curse and the lovers are freed. The enraged Bishop's anger begins to show and he arms his spear, but before he can attack, Navarre launches his sword at him and the corrupt Bishop is impaled onto his altar. Navarre and Isabeau embrace in the cathedral, while Phillipe and Imperius feel proud of their work in the adventure.
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