The Four Halstead

Season 1
Jay and Will Halstead in their childhood made two best friends Craig "Mouse" Gurwitch and Cassy "Cani" Montenegro, together they form the four Halsteads.When an old enemy of the army of Jay and Craig and Cassy kidnaps Will the three unite to save the redhead with the help of the team of Hank Voight

Season 2
When the past knocks the door is impossible to ignore."Members of battalion 51 are called because of a residential fire, but what they find is a child locked in the basement. His real identity brings with him a hidden past and a palpable threat leaving all members of the Voight Intelligence Unit on alert as did Jay and his group.

Season 3
The explosion in an ontinerante park puts the life of Jay, Elliot and Craig at risk. The investigation leads Voight to have to work with two FBI agents Hill and Montenegro in pursuit of a European bomber who smuggled into the country.

Season 4
While on the way home, Dominick Carisi finds a lonely and lost child on the streets of New York City, the investigation into the girl takes the Special Victims Unit team to Chicago.

Hank Voight and Olivia Benson come together to end a trafficking network.

* Originally this story was split up in four seasons posted separately in Portuguese, but I'll republish everything together here.*