They find a picture of Tsukasa and his mother at the beach and a coded message behind the photo deduced to be the location of the beach .
The Detective Boy 's investigate Tsukasa 's house and discovers a piece of the torn page confirming Conan 's suspicion .
They find a picture of Tsukasa and Conan 's mother at the beach and a coded message behind the photo deduced to be the location of the beach .
The Detective Boy 's investigate Tsukasa 's house and discovers a piece of the torn page confirming Conan 's suspicion .