DH+alfred+Hitchcock

//How do the detectives approach the crime scene?// the detectives looked at everything, and they took pictures of the blood stain on the floor with the carpet behind it

//What techniques for solving the crime are available (DNA, Fingerprint?)// they have fingerprints, no DNA they looked at every possible angle it was raining so they knew that the criminal didn't come through the window because there would have been mud on the floor the detective they didn't make the family move out of the house though...they are still living in the crime scene

//How is the crime solved?// the detective went to the house to investigate further and to ask the family questions the crime was solved because Mark found the suitcase with all the money in it The detective switched the keys in the coats detective went to the bank found the bank statement the key that was taken from the woman's handbag didn't fit the lock he found the key (wife's key) under the stair carpet when Tony took the key from the dead guys pocket, it was really the dead guys

the husband had a briefcase

Mark figured everything out, even though he didn't know