Which Agatha Christie Novel Has The Most Complex Mystery Like 'Psycho-Pass'?

I'm a half-baked forensic examiner whose only redeeming quality is the ability to understand animals. The crime scene is inside a lavish villa. The lady of the house lies dead on the floor with a blunt-force injury to the back of her head so deep that her bone is visible. The safe has been pried open, and a million dollars in cash has vanished without a trace. Clear shoe prints mark the backyard wall, evidence that someone has climbed over it. "This one's clear as day. This is a textbook robbery-homicide. The suspect is likely a young male, around six feet tall, has a prior theft record, and knows how to cover his tracks. Check the surveillance footage in the area and look into places where he might've moved the stolen cash." The director of the forensic science center, Egbert Woodward, has been in the profession for three decades and is a widely respected authority. The officers at the scene nod in unison and begin taking notes. I'm the only one who stares at the 30 flies circling the ceiling for a full 3 minutes before taking a step forward and piping up, "Dr. Woodward, this isn't a robbery-homicide. It's a crime of passion. The murderer is the victim's husband!"

"Noooooooooooooo!" With a loud shrieking voice. "Stopppp! Not again, not even here". Sobbing, trying to get a grip of what had happened, again. Her body vibrates violently, with her hands shaking and moving like they have a mind of their own. Her glowing eye is so noticeable even with the dark shades on. Her body violently jerked, spilling the hot pasta and orange juice all over the dining table and her denim shirt, while she tried her best to keep calm and behave as if everything was fine. A secret only her mum used to know about has grown wings and flown out, in the cafeteria!. "Hell no, I have to do something." She whispered to herself. But sadly, there was nothing to be done. The damage had been done already. Anxiously, she picked her backpack and brought out her journal, and placed it on the messed-up dining table. She could hear some of the students calling her a freak, and as usual, all looking at her in disgust. Her heart sinks every time that happens, knowing she's going to be the talk of the school, and she hated that. She hated all of it, and self-flagellation was as tempting as the garden of Eden. She just wished she could just disappear from the surface of the earth. Then suddenly, The bell rang, lunchtime was over. "Finally," She muttered, with a deep sigh. Yes, she is a PSYCHIC, and she's 16. She is a psychic who has another being in her. She had five friends, each with a secret to keep. they had to team up to solve the mysterious Homicide going on in their peaceful town, and in the process, they learnt each other secrets and the town's history. Will they be able to solve the mystery?

Detective Catharine Maximo whose sister also disappeared, came looking for the mastermind behind this mystery. Every year a girl would be found missing. She's been wanting to solve this and find out the culprit for months. Recently, a corpse was found. It was evident that the victim was brutally murdered. She digs information. But could she ever find her sister alive by then? What is the cost of solving the mystery of-- Eency Weency?

Hayden is a perfect husband for Riz. He's sweet, self-orientated and a successful doctor. They are living happily until a crime happened in their city. A crime of the past. Suddenly, their peaceful life will be fully be entangled into the world of serial killing. It will confuse their life, their marriage and trust especially when Riz started to doubt her own husband's personality. It doesn't make sense. Is her husband the serial killer?

With her enemies in pre-civil war Virginia still seeking her death, Esmerelda is forced to return to the future only days after wedding Lance. Because it was necessary to fake her death in order to stop her enemies from following her to the future, her new husband, Lance, was forced to stay behind. He’d placed a magic box for them to communicate until he found a way to safely be with her beneath the floorboards of the house. Now, she must find it. A task that is easier said than done! “The Magic Box” is book two of the exciting paranormal-romance-mystery-thriller Esmerelda Sleuth Series

Alice Warren was the daughter of two famous murderers. Her fate, which was full of bad luck, finally met its end when the Le Blancs adopted her. The Le Blancs were good and kind people; they helped the poor, donated to charities, and built an organization for the orphans called UNITY. Alice was already contented with her life, but all of her beliefs and luck crumbled down when she entered Saint Clair Academy, and the series of accidents and deaths started again. Of course, it did not help that an irritating genius artist, Thomas Saint Clair, was always at her tail. Now that the number of dead bodies increased, Alice had to investigate whether the accidents were just lousy luck full of coincidence or carefully planned-out murders.