The casino murder case by SS Van Dine

Another Philo Vance book; not bad, the plot was a bit more interesting than 'the dragon murder case'  but here there was no character that touched my heart. My curiosity on Van Dine was satisfied, though, in a few lines where I could learn that Van Dine and Vance were at University together and great friends too, so Van happily left his job in his father's firm (Van Dine, Davis and Van Dine) to go working for Vance, as a sort of secretary-lawyer-accountant..
The plot is..well, I must start from the end and explain everything right away, or it'll take me pages. So, rich Lynn Llewellyn lives with his wife Virginia, his mother and sister, his uncle Kincaid who owns the casino. The facts are: Vance is involved from the start because of a letter warning him that something will happen. During a night at Kincaid's casino Lynn feels sick and is brought to the hospital, because he's been poisoned. That same night his wife dies, poisoned. Shortly after, his sister is poisoned too, but like Lynn she gets well rather quickly. Every step seem to point at Kincaid, but Vance knows from the start that he's being framed, because of the letter. The final showdown shows Lynn threatening Vance, Van Dine and Markham with a gun, confessing everything. Honestly I wasn't all that surprised: when a wife dies, first thing to do in an investigation is: suspect the husband! He put poison in his wife's eyedrops, but he used something different and less dangerous to poison himself. At the end he wanted to shoot them inside Kincaid's casino, because he wanted Kincaid arrested for murder. Vance had sergeant Heath record the confession, and Kincaid's himself came to help, previously called by Vance. Honestly Markham doesn't seem all that much to me: brave and strong, yes, but not intelligent at all, always hasty in accepting the simple (and wrong) solution that is presented to him, and always impatient. I like more sergeant Heath. What surprises me every time is that Vance does everything: the interrogations, the investigation, he gives orders to everyone and they all obey him, and Markham does nothing but follow him waiting impatiently for his solution of the case. Pretty useless I'd say.