I had the game Emergency Call 112 on steam at the fire department simulation in the library & now it's gone and I don't know how to find it again.
Just search for it or find it in the trash
Is the game gone on the laptop or within Steam? If a purchased game should be in your Steam library and is now missing, only Steam customer service can help you → Cover letter / call!
If you only mean your laptop; If an installed game (program) is suddenly missing from your PC, run a virus scan and check all other programs. In this case, however, you can download and install again from the Steam library at any time.
Was a bought game
Not found in either
If you are missing a game you bought, look up your payment confirmation from that time and contact Steam yourself or their support. Unfortunately, we as third parties have no access to their customer system.