Plot
Rachel Moore has recurring nightmares about her mother Eva being shot, which connects to a past incident where Eva, Richard's wife and Rachel's mother, was accidentally wounded during a police standoff involving Richard and a criminal named Jake Morono. While Rachel struggles with the truth, Richard and Conan Edogawa become involved in a string of attacks start with Joseph Meguire, Eva and Dr. Agasa and linked to playing cards left at crime scenes.
The case intensifies when friends and acquaintances of Richard—including golfer Henry Tish, sommelier Kevin Simms, and businessman Christopher Aston—are targeted. At the AquaCrystal complex, several murders occur, each tied to the spade suit. Suspicion initially falls on Morono, but Conan deduces the real killer is Kevin Simms, who faked being a victim.
Kevin's motive stems from losing his sense of taste after an accident caused by Nina Oliver and his resentment toward others in his circle. Using bombs and staged traps, he attempts to eliminate his targets and escape, but his plan collapses. Richard subdues him, ensuring he faces justice.
In the aftermath, Rachel reconciles with Richard, realizing his actions years earlier were to protect her mother. A final scene reveals Eva left Richard not over the hostage incident, but because of his harsh criticism of her cooking.