Do You Like Dan Brown’s novel, The Da Vinci Code?
Try these Read-alikes:

Dan Brown - Deception Point

John Case - The Genesis Code

Deborah Crombie - A Finer End & Kissed A Sad Goodbye (history mixed with mystery)

Any book by Clive Cussler (action element)

Any book by Nelson DeMille (action element)

Umberto Eco - Foucault’s Pendulaum (Templar history)

Michael Frayn - Headlong (art mystery)

Julie Kaewert - Uncatalogued: A Booklover’s Mystery

Robert Ludlum - The Icarus Agenda (adventure)

Katherine Neville - The Eight (historical quest, Freemasons, solving chess riddles)

Any book by Iain Pears (art history mysteries)

Lewis Perdue - Daughter of God: A Novel of Art and Faith When God Was a Woman (actually suing Dan Brown for plagiarism!)

Jonathan Rabb - The Book of Q & The Overseer (religious conspiracy)