busy chasing ratts!

my little house mouse was a huge ratt and it even had babys :( so whole of yesterday we were trying to catch it we failed but atleast we thought we had trapped it but today tadaa the thing is gone! (#@&^%$$) it had taken some of the food mixed with poison but what should we do to find it now i just cant gett rest untill iw seen this thing killed and out of my house! dont get me wrong im a real animal lover but RATTS in my house no way!