Here are the answers to all of the game's puzzles -- they are not in exact order, since you can choose your path:

First answer (no choice available here): 21
Second answer: 2nd tram
Time of first murder: 6:05 (please note you have to put the two dots in between the 6 and the 0 for the game to recognize the time and accept the answer as correct.
From here the list may be different...
Route A
Mary Drower is 22 years old
Date of 2nd murder: 25
Fido
Barnard house number: 27
Unscrambled word is: FINGERPRINTS
10:14
% of pie each brother gets: 25
Thora's riddle: 34 notes
3 dogs
Mary Drower 2nd riddle: 29
Unscrambled word is: TRADE
there are 12 5's
Race: Green is 1st, Yellow is 2nd, Red is 3rd, White is 4th, Blue is 5th
Stranger shows at house at 11:20
Unscrambled word is: ARROW
4th murder will occur on the 11th
Unscrambled word is: STOCKINGS
Cubic feet: 0
Latps: 7
Hours: 25
Bahram is 1st, Caligula 6th, Fairway is 3rd, Hyperion is 5th, Sandwich is 2nd and Windsor Lad is 4th.
Sheep: 17
Unscrambled word is: BLOOD
Cust’s address: 19
Dominoes: 373
C) 2nd then 3rd
Opal, Susan, Alice
Egg
35%
16 bills
0 passengers
The real murderer is: Clarke
Lost Clues case: Oliver is guilty.