Wolf Castle: 4 books

For the past year, Mary-Anna has been stuck in a slump.  At a critical breaking point, she is left with two options: find a way to be happy or die.  With the help of her family and friends, she makes the decision to better herself in an extreme way!

After losing her husband to the war, Cristin shuts down when her daughter Kenna is diagnosed with a rare and uncurable cancer. Hope returns to the two when Cristin decides its time to make the best of the situation at hand. After an operation goes wrong, Kenna wakes up in a train station, unaware...

After decades of living in a world destroyed by nuclear fusion, one man will assemble a team in hopes of changing the future.  A mechanical genius, a theoretical physicist, a leader, and a wild card come together to achieve what was thought to be impossible with one goal in mind: learn Nikola Tesla's secrets from Tesla himself.

Could you resist the call to riches and exploration if it meant almost certain death? Many cannot. And on a small planet near the edge of our galaxy, that call was made.   it is an unlikely mixture that answers the call. With death in front and betrayal behind, they move the only direction...