Super: Discipline: Book 4 in the Super: Series

Lex and her friends receive a warning of things to come when an old friend shows up on their doorstep, near death. Not long after they find themselves embroiled in fighting an extradition attempt - the US government, having taken over the human experimentation labs the friends escaped, seems to want them all back, to work as collectors for other escapees. Finally, unable to stop the extradition, Lex and her team go back to the US. Instead of taking in people for the labs, however, they choose to warn their would-be quarry instead and allow them to escape. This serves to anger the government, making Lex wonder if she and her friends will end up back in their labs instead...