Detective Conan OVA 7: A Challenge from Agasa

Synopsis:

Conan and the Detective Boys have been asked to meet with Professor Agasa at his house, but they soon receive a chilling note from the Professor himself: he has been kidnapped, and would like for Conan and company to find him! After following the clues laid out before them, the gang realizes that the Professor is simply playing a game with them – that is, until the "game" turns dangerous and becomes real. Now, with the Professor actually kidnapped, Conan and the Detective Boys must race against the clock to find him before he gets hurt!