* AlternateCharacterInterpretation: When everyone claims Antoni Fortuny, Julián's [[spoiler: step]]father to be pure evil, several characters [[{{LampshadeHanging}} point out]] how strange this is. [[spoiler: We later discover that Antoni Fortuny was really just a messed-up guy who realized too late how much he loved and depended on his wife and son. When Julián comes back, he [[{{CrowningMomentOfHeartwarming}}takes him back in]] without asking any questions. He also dies [[{{TearJerker}} holding a photo of Julián and Sophie.]]]]
* CompleteMonster: Francisco Javier Fumero, the [[DirtyCop corrupt chief of police]] in Barcelona, relishes the power his position brings him. [[EnfantTerrible As a boy]], Fumero tortured small animals as an outlet for his sadism, and when he discovered Julian Carax, the one boy to treat him kindly, and Penelope, who Fumero lusted after, were together, he attempted to murder Julian and devoted his life to destroying him and Penelope alike. Fumero sent his men to kill Julian and personally murdered a woman who loved Julian for helping him. In the years that passed, Fumero terrorized the populace of Barcelona as a uniformed thug, [[ColdBloodedTorture torturing]] those who caught his ire. One luckless man named Fermin was held and beaten before Fumero tortured him with a blowtorch. When the young hero of the novel, Daniel Siempre, closes in on the buried story of Julian Carax, Fumero wastes no time in attempting to kill him and all who know the truth as well. Cruel, {{sadist}}ic, violent and insatiably power-hungry, Fumero represents how far a once almost pitiable boy can fall.
* TearJerker: Gosh, where to start?
** How about when Daniel talks to [[spoiler: Isaac, just after his daughter, Nuria, has been murdered]]?
** Or [[spoiler: Penelope's death]]?
** Or [[spoiler: Miquel Moliner's entire ''life'']]?
** Or [[spoiler: Jocinta Coronado's fate]]?