Recently, a series of assaults have been occurring against seemingly unconnected people – or are they? Soon, Kogoro Mori discovers that he is somehow the key to these crimes; the people being targeted are connected to Mori in some way, have something in their name that correlates to a playing card, and have a symbol from that card left next to the crime scene each time. But who is the assailant, and what does he have in mind for Mori himself? Conan must once more use his powers of deduction to put a stop to the madness…
Tachibana Sakon is a skilled puppeteer with an unusual hobby: solving murders. Along with Ukon, a one-of-a-kind puppet made in the Meiji era, Sakon manages to find himself in a variety of life-threatening situations. Join the duo as they put their detective skills to the test in terrifying cases of revenge, malice, and murder.
The mystery of "The Blade Children" is a secret which has remained well-hidden, and has cost some their lives. After Narumi Ayumu's brother disappears in a search for the answer, Narumi is forced to unravel this mystery for himself. Join him in his investigation which will lead him to the secrets of the Blade Children, and to tests of skill which may prove to be fatal.
Spiral is not an anime I'd recommend for every Detective Conan title; it is far more dark and sinister than a great deal of Detective Conan, and won't necessarily be enjoyed by the same audience at all times.
However, The Fourteenth Target is a relatively dark Detective Conan movie in comparison, and is filled with death aplenty. For this reason, you'd probably enjoy Spiral as well.