The Index of Alkeme

When thieves attempt to steal a mysterious package from Forthwick University, Addison does the unthinkable—he takes it himself and is propelled on an adventure of a lifetime across a world of steam and diesel on the brink of war.

With a self-made scientist, an ace fighter pilot, an expert codebreaker, and a renowned author at his side, Addison must solve the clues and decipher the codes that lead to an object said to unearth ancient technology far beyond their own. Now, the intrepid group of adventurers must race against time to uncover the fabled Index of Alkeme before fanatics can use its secrets to subjugate humankind.

----------

"It's an action adventure reminiscent  of Indiana Jones and Relic Hunter, with a dash of James Bond thrown in. It's also got elements of steampunk and dieselpunk."

-Goodreads review