"In Covert Front you are a secret agent code-named Kara in an alternate history version of World War I. Assigned to infiltrate the mansion of a German scientist, Karl von Toten, you must discover the secrets that lie within and escape with your life.".

crowbar, garden hose, used garden scissors, clock key, book and matches

the hose, used the scissors, a book and an ice pick!

get that key in the basement... i attached the hose but i dunno what is next!

hook up the hose and then go back outside. go to the left side of the entrance where the grate thing is and open it with the crowbar..then go down and turn the wheel before heading back down to the basement and using the lever this time where you attached the hose. this should drain the basement allowing you access to the key

crowbar?

go right and take sheers from box and hose from under the vines.
go left twice and use the sheers on the fuse box
Enter house and take note of the picture to your right
Go to the first door in your left
take matchbook from fireplace and icepick from middle cupboard(under table)
Go left and use the hallway picture to get the Clock Key
Go back to the hallway and look at the locked door
Use the icepick on the lock and get the crowbar
Head outside, go left and click the 'box' or wall
Use crowbar on sewer and turn off the pipe.
Head to the kitchen and down to the basement (next to fireplace)
Turn on the lights and use the pipe on the machine near the door and turn it on. Take the key.
Go upstairs
Take the first door on the left
Look behind the bed(table) and get the book.
Go back and use the library key on the rightmost door.
Place book in bottom row of bookshelf and pull out books;
1st row, fattest book
3rd row, nearest book
Take the rotating thing and turn left to take plans
Use zoom in and use the clock key on the cabinet and take ring
Go down to hallway and go forwards
Look at round indentation on the left wall of the picture and use ring
Head down and use the match on the oil lamp. Pick up fuse
Head right twice and use the fuse on the machine
Turn it on
go right and use crowbar on grate and head into it
Go left and use match.

You have to empty the water from the basement to get a silver key. Attach the hose to the machine at the entrance to the flooded room. Use the crowbar from the closet under the stairs on the sewer cover outside and turn the valve. To open the closet, use the ice pick from the kitchen drawer. Go back to the basement and flip the switch on the hose machine.

clock key from picture in hallway..???

it's outside, when you face the front door, turn right and it lies on the bottom

Head back upstairs. In the hallway, under the stairway on the right (very hard to see) is a small storage doorway. Click on it to zoom in, use the icepick on it to unlock it.