Merge 1sheet from every workbook

[ExcelTheCell]

Hi guy's well i am back and i hope you can help me....

I have 4workboks:
One
Two
Three
Four

And Every of them has two worksheet's with same name:
First
Second

Paths of workbooks:
One.xlsm= "C:\One\"
Two.Xlsm= "C:\Two\"
Three.xlsm= "C:\Three\"
Four.xlsm= "C:\Four\"

Main Book path:
MainBook.xlsm="C:\"

I want to merge only Worksheet "Second" from all workbooks into Mainworkbook that already contains also Worksheet "Second"... Also first Row contains Header..

Please help me 2 weeks and still don't have any good solution by now