Lords of the Sith

Lords of the Sith by Paul S. Kemp
A new canon novel set during the early days of the Empire. When Emperor Palpatine and Darth Vader are stranded on a hostile planet, they must use their own Force powers and fighting prowess to crush the resistance and escape to safety.

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This is a book from the New Canon timeline! It's guaranteed to be consistent with future movies, TV shows, books, and comics (and all new stories since mid-2014).

The Old Republic: Deceived

The Old Republic: Deceived by Paul S. Kemp
Spinning off from the sacking of Coruscant as seen in the preview to The Old Republic video game, this novel tells the story of a smuggler and a rogue Jedi pulled together into conflict with a brutal Sith Lord.

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This is an Old Republic era book from the Legends timeline. It may be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe)

Crosscurent & Riptide

Crosscurrent & Riptide by Paul S. Kemp
Two junk salvagers team up with a Jedi knight for an adventure that turns out to be much more than they bargained for, with danger around every turn, and dark mysteries lying in wait. Meanwhile, an ancient Jedi and Sith caught in a hyperspace time warp are on a collision course with all the action. Rollicking adventures starring a mostly new and endearing (but inexplicably all-male) cast of characters.

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Crosscurrent
Riptide

The ancient Jedi and Sith plotline in Crosscurrent is a spinoff from the first chapter of Lost Tribe of the Sith, set 5,000 years earlier.

These are post-Return of the Jedi novels from the Legends timeline. Think of it as an alternate universe from the sequel movies and newer books.